Fighting pixels:
http://pixelsfighting.com/

Is my computer on?
http://www.ismycomputeron.com/

Random color:
http://randomcolour.com/

What is the highest frequency sound you can hear?
http://onlinetonegenerator.com/hearingtest.html

Get an arbitrary award:
http://arbitraryawards.com/

Free art lessons:
https://artyfactory.com/art-lessons.html

Sorting set to dance: 
https://www.youtube.com/user/AlgoRythmics

Researchers' conflict of interest: 
https://projects.propublica.org/dollars-for-profs

Video surveillance software: 
https://www.contaware.com/

Data structures and algorithms: 
https://opendsa-server.cs.vt.edu/ODSA/Books/Everything/html/index.html 

Mount virtual drives: 
https://www.elby.ch/en/products/vcd.html 

Images of the sun:
https://sdo.gsfc.nasa.gov/data/

Brain-to-brain communication:  
https://www.nature.com/articles/s41598-019-41895-7.pdf

Edit triangular meshes:
http://www.meshlab.net/

3D scan from camera photos: 
https://alicevision.org/

Our universe:
https://www.seeker.com/series/focal-point

Free, accredited university:
https://www.uopeople.edu/

Break big ideas into manageable pieces:
https://workflowy.com/

What to say to fill the silence:
https://help-fill-the-silence.tumblr.com/

Binwalk firmware analysis tool:
https://www.basicinputoutput.com/2016/08/the-binwalk-firmware-analysis-tool.html

How to cut every fruit:
https://digg.com/video/learn-how-to-slice-pretty-much-every-fruit-correctly-so-you-dont-make-a-huge-mess

Windows Hot Key addon: 
https://www.autohotkey.com/

101 free fonts: 
https://www.shutterstock.com/blog/top-free-fonts-designers

Electronics for beginners: 
https://www.build-electronic-circuits.com/electronics-for-beginners/

Learn Linux: 
https://linuxjourney.com/

Travel guides: 
https://freetravelguides.com/

Free vector graphics:
https://www.vecteezy.com/

Memetics - A military growth industry: 
https://apps.dtic.mil/dtic/tr/fulltext/u2/a507172.pdf

How to get off of Google:
https://www.zdnet.com/article/goodbye-google-why-and-how-to-take-back-your-privacy/

Declutter your inbox: 
http://subscriptionzero.com/

Draw with an online turtle: 
https://turtletoy.net

Earthquake Emergency Handbook: 
https://www.wsspc.org/wp-content/uploads/2017/01/Handbook_FINAL_New.pdf

SAS survival manual: 
http://www.landsurvival.com/downloads/SAS%20Survival%20Handbook.pdf

Army survival manual:   
https://thesurvivalmom.com/wp-content/uploads/2015/03/FM_21-76-US-army-survival-manual.pdf

Survival guide: 
https://www.csustan.edu/sites/default/files/SRC/documents/SurvivalSkills.pdf

Paper phone: 
http://specialprojects.studio/project/paper-phone/

Crop a video: 
https://clideo.com/crop-video

Neural network completes your text: 
https://talktotransformer.com/

IC die photos:
https://zeptobars.com/en/

Warp speed in the solar system: 
https://gfycat.com/showyagedflyingfox-james-odonoghue-science-fiction-space-travel

Free stock footage: 
https://www.videvo.net

Create a ransom note: 
http://www.ransomizer.com

Find emergency rooms and their rating: 
https://projects.propublica.org/emergency/

Black Market Prices: 
https://cdn.armor.com/app/uploads/2018/10/2019-Q3-Report-BlackMarket-SinglePages-1.pdf    

Free PDF editor and converter: 
https://www.starzsoft.com/pdf-converter/

Learn to hack from scratch:
https://getnewcourses.com/learn-hacking-using-android-from-scratch/

Microsoft's free Python course: 
https://www.youtube.com/playlist?list=PLlrxD0HtieHhS8VzuMCfQD4uJ9yne1mE6

Fix a Zip archive: 
http://www.essentialdatatools.com/products/objectfixzip/

Visualizing the speed of light: 
https://gfycat.com/perkydetailedchamois

Uncheck boxes to install superfluous software: 
https://unchecky.com/

Free WannaCryFake ransomware decryption tool:
https://blog.emsisoft.com/en/34156/emsisoft-releases-free-decryptor-for-wannacryfake-ransomware/

Drug/supplement interaction checker: 
https://supp.ai/

Airport WiFi passwords: 
https://considerable.com/map-wifi-passwords-airports/

Personalized meal plans: 
https://www.eatthismuch.com

Instagram highlight pack: 
https://www.shutterstock.com/blog/free-instagram-highlights-covers

Non-profit identity theft help: 
https://www.idtheftcenter.org

AI analysis of your face: 
https://imagenet-roulette.paglen.com/

Car problem noises:
http://mycarmakesnoise.com/full-sound-library/

Online theramin:
https://femurdesign.com/theremin/

Build interactive fiction:
http://textadventures.co.uk/quest/

A century of global surface temperatures:
http://students.washington.edu/aodhan/webgl_globe.html

Bible's traditions in context: 
https://biblebrisket.files.wordpress.com/2014/01/exploring-genesis-the-bibles-ancient-traditions-in-context.pdf

Sentence dictionary: 
https://www.foboko.com/sentence-dictionary/

See colors that aren't there: 
https://faculty.washington.edu/chudler/benham.html

Drench game:
http://www.flashbynight.com/drench/

Shark/dolphin/seal tracker:
https://www.ocearch.org/tracker/

285,000 companies at the same 2-story building: 
https://www.youtube.com/watch?v=b00j2aCT6Ug

AI-generated inspiration
https://inspirobot.me/

Cutlist optimizer:
http://www.cutlistoptimizer.com/

Cube within a cube within a cube:
https://youtu.be/AuS6HDHc7XE

Song fingerprint: 
https://song-visualizer.firebaseapp.com

Convert to/from PDF:
https://pdf.to/

Keyboard music:
https://patatap.com

Urgent care or ER?
https://www.indigourgentcare.com/blog/the-right-place-for-the-right-care-urgent-care-vs-emergency-room

Calming videos:
https://napflix.tv/

What language is that?
https://lingyourlanguage.com/

Summarize any article:
https://tldr.hackeryogi.com/

Secure e-mail:
https://tutanota.com/

The roots of slavery:
https://www.nytimes.com/interactive/2019/08/14/magazine/1619-america-slavery.html

Online Encyclopedia of Integer Sequences:
https://oeis.org/?language=english

Technology news:
https://www.techmeme.com/

Programming instruction:
https://internetingishard.com/

Free mechanical CAD program:
https://www.rs-online.com/designspark/mechanical-software

Segregation and racist artifact museum:
https://www.ferris.edu/jimcrow/what.htm

Journey Planet:
http://journeyplanet.weebly.com/

Give your teddy bear a vacation:
http://unagi-travel.net/

All about toilets:
https://toilet-guru.com/

Calculators for construction, woodworkers, etc.:
https://www.blocklayer.com/

World's most relaxing song:
https://www.forbes.com/sites/jordanpassman/2016/11/23/the-worlds-most-relaxing-song/#7b895e8b2053

Known exoplanets:
https://exoplanetarchive.ipac.caltech.edu/

Tool to check and fix 3D models:
https://www.microsoft.com/en-us/p/3d-builder/9wzdncrfj3t6

3D design models:
https://www.myminifactory.com/

Auto VIN check:
https://www.vincheckpro.com/vin-go

Making cookie cutters:
https://www.youtube.com/watch?v=k66fqXttgpE

When can you reuse a calendar:
https://www.whencanireusethiscalendar.com/

Federal Reserve comic book:
https://www.newyorkfed.org/medialibrary/media/outreach-and-education/comic-books/NewYorkFed-StoryoftheFederalReserveSystem-WebColor.pdf

Dark patterns on shopping websites:
https://webtransparency.cs.princeton.edu/dark-patterns/

Create your own fake news:
https://grover.allenai.org/

Archive a web page:
https://archive.is/

English pronunciation:
https://youglish.com/

Light and sounds pets hate:
https://www.cnet.com/news/is-technology-driving-your-pet-insane/

Literal meanings for country names:
http://tiny.cc/countrynames

WiFi networks found:
https://wigle.net/

Preconfigured virtual Linux for investigations:
https://inteltechniques.com/buscador/

Free virtual private mobile number:
http://freesmscode.com

Price optimization game:
https://priceoptimization.ai/

Introduction to SQL for Data Scientists:
http://downloads.bensresearch.com/SQL.pdf

40 years of New York City photos:
http://mattweberphotos.com/

H.P. Lovecraft complete works:
http://arkhamarchivist.com/free-complete-lovecraft-ebook-nook-kindle/

Audubon native plants database:
https://www.audubon.org/native-plants

Visual comparison shopping:
http://www.findsimilar.com/

Feminist internet:
https://f-xa.co/

Best way to whisk:
http://digg.com/video/the-best-whisking-method-explained

Follow politicians:
https://app.politiscope.io/

Go for a walk:
https://walk.cafe/ 

Lists made social:
https://list.ly/

Image to text and translate:
http://projectnaptha.com/

3D human body:
https://human.biodigital.com/login/create

Learn geography:
https://lizardpoint.com/

New startups:
https://betalist.com/

Privacy-focused office tools:
https://cryptpad.fr/

Publish your research:
https://www.qeios.com/

What did Alexa hear and store?
http://www.amazon.com/alexaprivacy

Selfie teleprompter:
https://smartphones.gadgethacks.com/how-to/turn-your-phone-into-teleprompter-record-selfie-videos-without-breaking-eye-contact-0196702/

Soviet's code machine, better than Enigma:
https://foreignpolicy.com/2019/04/27/the-soviets-unbreakable-code-fialka-encryption-espionage-russia-kgb-spy/

A Bittorrent client:
https://www.qbittorrent.org/download.php

Whats on your PC?
https://www.ccleaner.com/speccy/download

Find hidden cameras:
https://www.howtogeek.com/411095/how-to-detect-hidden-surveillance-cameras-with-your-phone/

Inside the mind of a hacker:
http://tiny.cc/insidehackers

Free content distribution network:
http://coralcdn.org/

How a transmission works:
https://youtu.be/JOLtS4VUcvQ

Gravity points:
https://codepen.io/akm2/full/rHIsa

Classified ad exchanges:
http://www.dontevenreply.com/

Fake SD/USB tester:
https://www.majorgeeks.com/files/details/fakeflashtest.html

Cheap flights from where you are:
https://greatescape.co/

13.8 billion years for free:
https://school.bighistoryproject.com/bhplive

Ancient Rome, then and now:
https://www.boredpanda.com/before-after-roman-buildings-structures/

Ransomware rescue manual:
https://www.wired.com/wp-content/uploads/2016/03/RansomwareManual-1.pdf

Guided meditations:
https://www.tarabrach.com/guided-meditations/

Phish in a barrel:
https://duo.com/assets/ebooks/phish-in-a-barrel.pdf

Danish destress:
http://theconversation.com/a-danish-word-the-world-needs-to-combat-stress-pyt-112216

Talk about mental illness: 
https://seizetheawkward.org/

MIT Machine Learning textbook:
https://www.deeplearningbook.org/

Screen capture and file sharing:
https://getsharex.com/

8 hours of Star Trek Voyager crew quarters sounds:
https://www.youtube.com/watch?v=wHxBp4zPTBQ

8 hours of Star Trek TNG cargo bay sounds:
https://www.youtube.com/watch?v=5VNhGe3wOOE

8 hours of Star Trek TNG Engineering sounds:
https://www.youtube.com/watch?v=MNBA2U-L8dc

8 hours of Star Trek TNG Ten Forward sounds:
https://www.youtube.com/watch?v=4tzoIYyAhFY

8 hours of Star Trek TNG bridge sounds:
https://www.youtube.com/watch?v=UKBvaOLDem0

Mars' weather:
https://mars.nasa.gov/insight/weather/

Interactive programming environment:
https://repl.it

Computer generated cats:
https://thiscatdoesnotexist.com/

Computer generated faces:
https://thispersondoesnotexist.com/

Gene editing at home:
http://www.the-odin.com/

Chrome password protection tool:
https://security.googleblog.com/2019/02/protect-your-accounts-from-data.html

Live stream video:
https://www.youtube.com/live_dashboard_splash

File virus scanner:
https://virusscan.jotti.org/en

Snap an image of a webpage:
https://screenshot.guru/

Ultra-condensed books:
http://www.rinkworks.com/bookaminute/classics.shtml

Plane deformations:
https://mrdoob.com/#/124/plane_deformations

Medieval medicine:
http://theconversation.com/medieval-medical-books-could-hold-the-recipe-for-new-antibiotics-74490

Patience is a virtue:
http://www.patience-is-a-virtue.org/

Random street:
http://www.mapcrunch.com/

Rock, Paper, Scissors:
https://www.rock-paper-scissors-game.com/

Found notes:
http://foundmagazine.com/

Awkward photos:
https://awkwardfamilyphotos.com/

Stuck drawer simulator game:
https://games.increpare.com/Schubladesimulator/

Perfectly timed photos:
http://perfectlytimedphotos.com

Kim Jong-Il looks at things:
https://kimjongillookingatthings.tumblr.com/

Thinking about your partner can lower blood pressure:
https://uanews.arizona.edu/story/having-partner-present-or-mind-may-keep-blood-pressure-down

Learn to program for free:
https://www.sololearn.com/

Where can I watch a movie?
https://www.justwatch.com/us

Private, encrypted file sharing:
https://send.firefox.com/

Make a bootable USB:
https://rufus.ie/

Amazon giveaways and discounts:
https://www.amazon.com/ga/giveaways?pageId=1

Google's last result:
https://feelingunlucky.today/

Unroll toilet paper with your mouse wheel:
http://papertoilet.com/

Why time flies faster as you age:
https://qz.com/1516804/physics-explains-why-time-passes-faster-as-you-age/

Cut/paste emojis:
https://www.emojicopy.com/

Find a tutorial:
https://2uts.com/

Free Javascript course:
https://watchandcode.com/p/practical-javascript

Private search engine:
https://news.google.com/newspapers

Newspaper archive:
https://news.google.com/newspapers

Point and kill for Windows:
https://bitbucket.org/sta-ger/win-xkill/downloads/

Color wheel:
https://color.adobe.com/create/color-wheel/

Compress PDF files:
https://smallpdf.com/compress-pdf

Old SD memory card formatter:
https://www.sdcard.org/downloads/formatter_4/

Full moon:
https://www.reddit.com/r/space/comments/a6kzqr/the_full_rotation_of_the_moon_as_seen_by_nasas/

Inspriation:
https://ineedaprompt.com/

Elements through the centuries
https://www.reddit.com/r/educationalgifs/comments/a6lr6n/300_years_of_element_discovery/

Virtual credit cards:
https://privacy.com/

When was a webpage posted?
http://carbondate.cs.odu.edu/

Old masters' Easter eggs:
http://www.artspace.com/magazine/art_101/conspiracy-theory-for-art-nerds-find-the-eerie-easter-eggs-hidden-in-6-old-master-paintings

Raising self-reliant children:
http://www.freerangekids.com/

DIY home decor:
https://www.simphome.com/

Yet more free movies:
https://www.roku.com/whats-on/the-roku-channel

Even more free movies and TV:
https://www.snagfilms.com

More free movies and TV:
http://popcornflix.com

Free movies and TV:
https://www.sonycrackle.com

Reduce image size:
https://squoosh.app/

Coding quizes:
https://coderbyte.com/quiz

Convert web app to desktop app:
https://applicationize.me/now

Researcher network:
https://www.researchgate.net/

Learn to hack:
https://www.hacksplaining.com/

2050 Weather:
https://www.vox.com/a/weather-climate-change-us-cities-global-warming

Burn OSs to USB sticks or SD cards:
https://www.balena.io/etcher/

Automated vehicle safety:
https://www.rand.org/content/dam/rand/pubs/research_reports/RR2600/RR2662/RAND_RR2662.pdf

Search words by when first used:
https://www.merriam-webster.com/time-traveler

Windows Explorer alternative:
http://multicommander.com/

Company contact info:
https://www.elliott.org/company-contacts/

Take flight:
https://www.foldnfly.com/

Interesting news:
https://www.tickld.com/

Programming finishing school:
https://thoughtbot.com/upcase

Free undelete for Windows 10:
https://www.easeus.com/data-recovery-solution/free-undelete-software-windows-10.html

Screaming goat piano:
http://www.screaminggoatpiano.com/

Dividing circles:
http://www.koalastothemax.com/

A sad trombone:
https://www.anothersadtrombone.com/

Pull my nose:
http://vectorpark.com/head/

Meteorological info:
https://www.ventusky.com/

Create a website:
https://www.jimdo.com/

Control someone else's electronics:
http://www.drivemeinsane.com/

Free credit freeze:
https://www.marketwatch.com/story/freezing-your-credit-is-now-free-2018-09-21

Java tutorial videos:
https://www.youtube.com/watch?v=TBWX97e1E9g&list=PLE7E8B7F4856C9B19

Open source video editor:
https://kdenlive.org/en/features/

Any positive number is sum of three (or less) palindromes
http://www.rnta.eu/cgi-bin/three_palindromes/pal3.py

Open source painting tool:
https://krita.org/en/features/highlights/

Image viewer:
https://nomacs.org/

Snapzu web posts:
https://snapzu.com/

Visual microphone:
https://www.youtube.com/watch?v=npNYP2vzaPo

Where can you park you spaceship?
https://parkmyspaceship.com

Clone your disk in the clouds:
https://rclone.org/

Make your PC into a hotspot:
http://www.mypublicwifi.com

Vedic math books:
http://www.vedicmaths.org/resources/books/free#book

Journey to the center of the earth:
http://www.bbc.com/future/bespoke/story/20150306-journey-to-the-centre-of-earth/index.html

Mount Rushmore's Hall of Records:
https://www.nps.gov/media/photo/gallery.htm?id=F51F46AD-155D-4519-3E23A791A6417362

Group Theory coloring book:
http://www.coloring-book.co/

Identify fake photos:
https://www.getsurfsafe.com/

Zoom quilt:
http://zoomquilt.org/

Nothing for something:
https://payfornothing.club/

Exercise for muscle groups:
https://musclewiki.org/

Odd Internet photos:
http://internethistory.tumblr.com/

Google Feud game:
http://www.googlefeud.com/

Weird or confusing:
https://weirdorconfusing.com/

The earth over time:
http://dinosaurpictures.org/ancient-earth

Math tools:
https://onlinemathtools.com/

Help research:
https://www.zooniverse.org/

Everyday sayings:
https://www.stylist.co.uk/books/everyday-sayings-explained/124076

Peer-to-peer file transfer:
https://file.pizza/

Machine Learning 101:  http://tiny.cc/ML101

More free photos:
https://www.pexels.com/

Free stock photos:
http://makerbook.net/photography

3D cat portraits:
https://www.boredpanda.com/realistic-cat-portraits-needle-felting-wakuneco/

Find a podcast:
http://www.podcasts.com

Free Artificial Intelligence course:
https://www.elementsofai.com/

Free screen design tool:
https://www.invisionapp.com/

HTML5 interface visual authoring:
http://maqetta.org/

Forever falling:
http://www.fallingfalling.com/

Make some music:
https://onlinesequencer.net/

What others have achieved:
https://www.agegeek.com/

HTML cheat sheet:
http://hostingfacts.com/html-cheat-sheet

Programming community:
http://www.devshed.com/

Find keyword ideas:
https://neilpatel.com/ubersuggest/

Scientific calculator and more:
http://www.kalkules.com/

Free cyber security training:
https://www.cybrary.it/

Voice recognition in Chrome browser:
https://dictation.io/

Free web-based PDF editor:
https://www.pdfescape.com/

Drag and drop Android and iOS apps:
https://thunkable.com/#/

Help a sight-impaired people:
https://www.bemyeyes.com/

Temporary or limited credit card numbers:
https://privacy.com/

Automating Chrome:
https://www.maketecheasier.com/extensions-automating-repetitive-browsing-tasks/

Printing on wood:
https://www.instructables.com/id/5-Ways-to-Print-on-Wood/

Create a digital signature:
https://www.mylivesignature.com/

Circuit board class:
http://www.instructables.com/class/Circuit-Board-Design-Class/

Web code IDE:
http://www.codelobster.com/

Free FAX:
http://www.free-fax.online/

Budget planner:
https://www.mymicrobalance.com/en

Make visual presentations:
https://www.easel.ly/

Create your own Alexa skills:
https://blueprints.amazon.com/

Fix Windows' 100% disk usage:
https://windows101tricks.com/100-disk-usage-in-windows-10

The psychology of Tokyo's subway:
https://www.citylab.com/transportation/2018/05/the-amazing-psychology-of-japanese-train-stations/560822/

Web Oasis browser start page: 
https://weboas.is/

What Google knows about you:
https://takeout.google.com/settings/takeout

Find long-tail keywords:
https://kwfinder.com/

Free vector icons:
http://flaticon.com

Free movies:
https://tubitv.com

Machine learning video library:
http://work.caltech.edu/library

Open source desktop publishing:
https://www.scribus.net/

Computer assisted drawing:
https://www.autodraw.com/

Animation software:
http://opentoonz.github.io/e/index.html

AI semantics:
https://research.google.com/semanticexperiences/

Online PDF tools:
https://www.hipdf.com/

Facebook's guide to their human censors:
https://www.facebook.com/communitystandards/

Why you feel sick when you are:
https://m.youtube.com/watch?v=gVdY9KXF_Sg

Decentralized search engine:
https://yacy.net/en/index.html

Integrate workflows:
https://zapier.com/

Is a website up?
https://www.upornah.com/

Make your own spreadsheet-like calculator:
https://instacalc.com/

Compose a relaxing sound:
http://chillnsound.petrovicstefan.rs/

Social media dashboard:
https://www.cyfe.com/

Multi-engine image search:
http://www.reverse-image-search.com/

Android's Java bytecode:
https://dzone.com/articles/introduction-to-java-bytecode

Make a microscope for your smartphone:
https://youtu.be/KpMTkr_aiYU

Search and download PDF files:
https://www.pdfdrive.net/

Machine learning algorithms:
https://dzone.com/articles/ten-machine-learning-algorithms-you-should-know-to

Hex color to Pantone translator:
https://codebeautify.org/hex-to-pantone-converter

Printer ink scam:
http://digg.com/video/ink-cartridges-scamprint

Building in a bag:
https://www.youtube.com/watch?v=Vb1pdvvoVoQ

Murder Accountability Project:
http://www.murderdata.org/?m=1

News from space:
https://www.jpl.nasa.gov/news/index.php

Create animated videos:
https://www.powtoon.com/home/

Woodworking projects:
https://www.popularwoodworking.com/projects/icandothat

Backgrounds of words:
https://www.etymonline.com/

Open source video conferencing:
https://jitsi.org/

Coding games:
https://www.codingame.com/start

Go to the sun:
http://parkersolarprobe.jhuapl.edu/The-Mission/Name-to-Sun/

Trunk monkey:
https://youtu.be/XW8iAVwt_Yc

Recipes for what you have:
http://www.myrecipes.com/partner/ghirardelli/

Illuminating science:
https://www.quantamagazine.org/

Self-destructing note:
https://privnote.com/

Fake out fast coding:
https://hackertyper.net/

Make a URL into something dangerous:
http://www.shadyurl.com/

Food still good?
http://stilltasty.com/

Find similar movies:
https://www.movie-map.com/

Chatbot with no coding required:
https://mobilemonkey.com/

Invisible Internet Project:
https://geti2p.net/en/

Acronyms and slang:
http://m.acronymsandslang.com/

Solve math problems:
https://www.cymath.com/  

Make happy little programs:
http://ncase.me/joy/

Online university courses:
https://www.class-central.com/

Classify an image:
https://demos.algorithmia.com/classify-places/

Design a logo:
http://www.coolletters.net/

PC rescue kit:
https://paul.is-a-geek.org/aio-srt/

Music for work:
https://focusmusic.fm/

Search the web, plant a tree:
https://www.ecosia.org/

Clean vinyl records:
https://www.youtube.com/watch?v=TpL0HDIFOW4

Iconic font:
https://iconmonstr.com/iconicfont/

Photos from 22 free stock photo websites:
https://www.sitebuilderreport.com/stock-up/

Movie/TV computer screens:
http://geektyper.com/

130 years of National Geographic covers:
https://www.youtube.com/watch?v=Vk-HI3SDoH0

Generate blog topic ideas:
https://www.hubspot.com/blog-topic-generator

Tie tying hack:
https://youtu.be/J1SsAddFIsI

Reduce PDF size:
https://www.ilovepdf.com/compress_pdf

Virtual credit cards:
https://privacy.com/

Colorize black/white photos:
http://demos.algorithmia.com/colorize-photos/

Meat calculator:
https://www.blitzresults.com/en/meat/

Do you have a twin?
https://lexibay.com/find-out-if-you-have-a-twin-in-this-world/

Marble run Tchaikovsky:
https://digg.com/video/tchaikovsky-marble-run

Create a video:
https://biteable.com/

Website copier:
http://www.httrack.com/page/1/en/index.html

Video converter:
http://www.freemake.com/free_video_converter/

Distraction-free editor:
https://wereturtle.github.io/ghostwriter/

The sound of quantum computing:
https://www.youtube.com/watch?v=o-FyH2A7Ed0&t=14s

A conference call in real life:
https://www.youtube.com/watch?v=DYu_bGbZiiQ

Convert document format:
http://pandoc.org/

Android apps on Windows:
https://www.digitaltrends.com/computing/how-to-run-android-apps-in-windows/

Free courses:
https://www.udemy.com/courses/search/?q=free

Secure messaging:
https://telegram.org/

FInd manuals:
https://www.manualslib.com

Internet live stats:
www.internetlivestats.com

Classic games in Chrome browser:
https://elgoog.im/snake/

Capture video of Windows desktop:
https://www.cockos.com/licecap/

Free stock photos:
https://stocksnap.io/

Private messaging and file transfers:
https://keybase.io/

Forward scam e-mail tome@rescam.org:
https://www.youtube.com/watch?\v=jPajqAJWiNA

Credit card spoof:
https://samy.pl/magspoof/

The news from all sides:
https://www.allsides.com/

20 years of changing seasons:
https://phys.org/news/2017-11-years-seasons-earth-minutes.html

A better command line search tool:
https://beyondgrep.com

Don't be a sucker, still relevant after more than 70 years:
https://www.youtube.com/watch?v=vGAqYNFQdZ4

Couch surfing:
https://www.couchsurfing.com/

Global trip planner:
https://www.rome2rio.com/

Find air travel bargains:

http://www.secretflying.com/usa-deals/

Real news:
http://mercurynews.ca.newsmemory.com/

World poverty clock:
http://www.worldpoverty.io/

How to:
https://imgur.com/gallery/XzQbf

Chop a section of a YouTube video:
http://www.tubechop.com/

The faces of FaceBook:
http://thefacesoffacebook.com/

Type and come back later:
http://typehere.co

How to be creative:
http://changethis.com/manifesto/6.HowToBeCreative/pdf/6.HowToBeCreative.pdf

Design a website:
https://webflow.com/

Chords for any song:
https://chordify.net/

Paintings mess with your mind:
http://www.trendfrenzy.net/amazing-paintings

Casini photo e-book:
https://www.nasa.gov/connect/ebooks/the-saturn-system.html

KKK or Breitbart?
http://www.slate.com/blogs/the_vault/2017/09/14/quiz_tests_whether_headlines_came_from_breitbart_or_1920s_kkk_newspapers.html

Gait simulator:
http://www.animalsimulation.org/files/2b09f1333fe891f305395355a11ac7c6-4.html

AI inspiration: World poverty clock: http://www.worldpoverty.io/
http://inspirobot.me/

Virtual keypunch:
http://www.masswerk.at/keypunch/

British Museum 3D scans:
https://sketchfab.com/britishmuseum

Kaspersky Free Antivirus:
https://usa.kaspersky.com/free-antivirus

Collaborating editor:
https://draftin.com/

Linux Live CD running on Windows:
http://www.mobatek.net/labs_mobalivecd.html

Wide band radio:
http://websdr.ewi.utwente.nl:8901/

Free tech books:
http://www.freetechbooks.com/

Buzzwords to avoid:
https://sba.thehartford.com/business-management/60-business-buzzwords-to-delete-from-your-vocabulary

Manage digital photos:
http://www.mobatek.net/labs_mobaphoto.html

Lock your keyboard:
http://www.howtogeek.com/howto/11570/disable-the-keyboard-with-a-keyboard-shortcut-in-windows

All about logos:
http://www.bluesodapromo.com/blog/logo-design.pdf

Consumer Reports car buying service:
http://www.consumerreports.org/cro/car-prices-build-buy-service/index.htm

Open source signal analysis software:
https://sigrok.org/

Alternatives to "very":
http://www.grammarcheck.net/very

Superbird - the fastest browser:
http://superbird-browser.com/

Learn X in Y minutes:
https://learnxinyminutes.com/

Shadows brought to life:
https://digg.com/2017/shadow-street-art-damon-belanger

Lynching in America:
https://lynchinginamerica.eji.org/

Native apps in a browser:
https://appetize.io/

Domino homage to games:
https://www.youtube.com/watch?v=Q0jeohWnmAQ

Phone number information:
http://www.spydialer.com/

Odd physics archive:
http://amasci.com/amateur/physvids.html

A Capella Science:
https://www.youtube.com/user/acapellascience

Radiator music:
https://digg.com/video/radiator-song

Convert files (215 formats):
https://cloudconvert.com/

Legendary mythology:
http://www.godchecker.com/

Useful Regex patterns:
http://projects.lukehaas.me/regexhubprojects.lukehaas.me/regexhub

Historical photos:
http://www.historyinorbit.com/175-fascinating-little-known-photos-of-the-past/

Android hacking apps:
http://www.geeksgyan.com/2015/12/top-20-best-android-hacking-apps.html

How bad is your water?
https://www.ewg.org/tapwater/index.php

Free vector art:
http://www.creativebloq.com/graphic-design/best-places-free-vector-art-1012985

Project NYC Subway:
http://www.projectsubwaynyc.com/

Free audio books and e-books:
http://www.digitalbook.io/

Mars time-lapse:
https://www.newsbreakapp.com/n/08V4dnH6?s=a3

Domino course and fire:
https://www.youtube.com/watch?v=QIyiGrMt0BI

Social website list:
http://wikipedia.org/wiki/List_of_social_networking_websites

Medieval doodles:
http://www.atlasobscura.com/articles/medieval-marginalia-books-doodles

Learn a language while waiting:
https://people.csail.mit.edu/ccai/waitchatter/

Anonymous BitTorrent:
https://anomos.info/wp/

Opera Neon - new browser:
https://www.opera.com/computer/neon

Google Voyager virtual trips:
https://earth.google.com/web/data=CgQSAggB

Art via texts:
https://www.sfmoma.org/read/send-me-sfmoma/

Interactive periodic table:
http://elements.wlonk.com/ElementsTable.htm

Robot legal help:
https://donotpay-search-master.herokuapp.com/

What 2000 looked like in 1899 France:
http://www.openculture.com/2015/09/how-french-artists-in-1899-envisioned-life-in-the-year-2000.html

Benford's Law:
http://blog.cluster-text.com/2015/10/20/detecting-fraud-using-benfords-law-mathematical-details

Online grocery where everything is $3:
https://brandless.com/

Galaxy SciFi magazine archive:
https://archive.org/details/galaxymagazine&tab=collection

Google Translate songs:
https://www.youtube.com/watch?v=QKxaxrxVMsg

100 Life Hacks:
https://www.youtube.com/watch?v=t04s4NB6ROE

Fake news:
http://www.fakingnews.firstpost.com/

Smithsonian National Museum of Natural History online:
http://naturalhistory.si.edu/VT3/

Goldfish with a hammer:
https://vimeo.com/208067675

Prince Rupert Drops - stronger than bullets:
https://digg.com/video/shooting-prince-ruperts-drop

Short by District 9's director:
https://www.youtube.com/watch?v=VjQ2t_yNHQs

Flux capacitor listing:
http://www.oreillyauto.com/flux-capacitor.html

Interesting images from Google Street View:
http://9-eyes.com/

Popcorn exploding:
https://www.youtube.com/watch?v=FSZd33awqQk

Fix Windows 10 problems:
http://www.thewindowsclub.com/fixwin-for-windows-10

Picking a clear lock:
https://digg.com/video/lock-picking-clear

Free management books:
http://www.free-management-ebooks.com/

Verify unaltered photos:
https://truepic.com/

Program a quantum computer:
https://quantumexperience.ng.bluemix.net/qx/user-guide

Music notation:
https://m.youtube.com/watch?v=ZN41d7Txcq0

What poor vision looks like:
http://www.eye-sim.com/

Solve math problems:
https://www.mathway.com/Algebra

Improve your writing: 
https://chrome.writefullapp.com/

Incredible photo restorations:
https://petapixel.com/2017/01/19/photo-restorations-may-boggle-mind/

Find "interesting" files:
http://www.makeuseof.com/tag/how-to-find-unprotected-website-directories-get-interesting-files

Congressional predictions:
http://predictgov.com/projects/congress/

Back up your Gmail messages:
http://www.upsafe.com/

Multiphysical simulation software:
https://www.csc.fi/web/elmer

Learn something new: 
http://brainpump.net/

Tutorials :
https://www.chalkstreet.com/

Can you do nothing for 2 minutes?
http://www.donothingfor2minutes.com

80/20 rule is everywhere:
https://www.youtube.com/watch?v=fCn8zs912OE

Recipes for what you have:
http://myfridgefood.com

Find unpywalled scientific papers:
http://unpaywall.org/

Ripen fruit faster:
https://lifehacker.com/5811686/ripen-fruit-faster-by-burying-it-in-rice

Print grid paper:
http://gridzzly.com/

Portable apps:
http://portableapps.com/

Free vector graphics, icons, photos:
http://www.freepik.com/

Multi-platform internet speed test:
http://speedof.me

Cost of segregation:
http://www.urban.org/research/publication/cost-segregation

Comics:
http://comics.azcentral.com/

NASA image and video library:
https://images.nasa.gov/#/details-KSC-as11-40-5948.html