Everything worth keeping on the internet. One ark.
A hand-picked index of the most valuable places online. Free to use, built for knowledge, and chosen for how long they will matter.
Khan Academy
Free lessons from arithmetic to calculus, for every age.
ocw.mit.eduMIT OpenCourseWare
Real university courses, with lectures and problem sets.
wikipedia.orgWikipedia
The largest shared encyclopedia in human history.
gutenberg.orgProject Gutenberg
Over 70,000 classic books, free and open to read.
arxiv.orgarXiv
Research papers in science and mathematics, read before they are published.
ourworldindata.orgOur World in Data
Clear charts on how the world is changing.
archive.orgInternet Archive
Websites, books, audio and video, preserved for the future.
pubmed.ncbi.nlm.nih.govPubMed
Millions of biomedical studies from around the world.
github.comGitHub
Where the world's open source software is made together.
developer.mozilla.orgMDN Web Docs
The trusted reference for HTML, CSS and JavaScript.
stackoverflow.comStack Overflow
Answers to millions of programming questions.
huggingface.coHugging Face
Open AI models, datasets and demos you can use today.
blender.orgBlender
Professional 3D, animation and video, free forever.
fonts.google.comGoogle Fonts
Open typefaces for any project, ready to use.
openverse.orgOpenverse
Images and audio you are free to reuse.
creativecommons.orgCreative Commons
Simple licenses that let creative work travel.
Value is not what is loudest. It is what lasts.
Free to start
Every place here can be used without paying.
Built to last
We pick sources that have earned trust over years.
Made for people
No ads, no tracking and no sign-up on OneArk.