Internet Archive
The Internet Archive is the category pick. Founded by Brewster Kahle in 1996 as a non-profit digital library, it now holds over 800 billion web pages in the Wayback Machine plus millions of books, films, audio recordings, and software titles — most of them free to read, watch, or play in your browser. The Wayback Machine alone is reason enough to feature it: without that archive, the early internet would simply be gone. Geocities, the original Yahoo! directory, dead news sites, defunct webcomics, your own first website from 2003 — all preserved because one organisation decided the open web was worth keeping. The Archive also hosts the largest legal collection of public-domain books, the largest collection of in-browser-playable arcade games on the internet, every Grateful Dead show that was ever recorded, and a substantial fraction of cinema that has fallen out of copyright. It runs on donations. It is, in our editorial opinion, the single most important website still online.