This list will keep expanding over time!
The Small Web
The Website Obesity Crisis
Recommended read if you don't know about the extent to which the web is unjustifiedly bloated, and how it's affecting you and others.
Project Gemini FAQ
Solar-powered website about low-tech solutions to many aspects of life. The sections about setting up a solar-based server are of particular interest.
Read with caution: They have expressed anti-vaccine and anti-medication ideas in the name of low tech, in an article I read.
Non-profit library of millions of free books, movies, software, music, websites, and more. Check out the Internet Arcade section under the Software tab for a collection of old games (some of them might be NSFW).
Website providing mass public access to research papers, "to remove all barriers in the way of science".
Thread on the best places for piracy, and general tips on how to avoid malware (stay out of The Pirate Bay). May include NSFW content.
Disposable temporary e-mail adress generator: to avoid spam when forced to provide an e-mail adress to download something, for example.
A color palette generator.
To blend and pick colors in Hex or RGB format, with up to 10 midpoints. Could be useful for your Neocities site.