GPS.gov's directory of status reports and operational directories.
A considerable directory of stuff that aspiring Internet shady-type folks will find useful: Bittorrent trackers, services, software, and more. For informational purposes only, of course.
We capture snapshots of RSS feeds as their contents are updated. These snapshots can be accessed by browsing through the list of snapshots for each RSS and the articles listed in each snapshot.
A curated list of the most popular libraries and applications for many different languages and fields.
Build your own (insert technology here) when you know nothing about it. Dozens of links to curated tutorials about lots of different things, from 3D rendering to how network stacks work to other stuff.
IntelTechniques Search Tool. Use the links to the left to access all of the custom search tools and resources. This repository contains hundreds of online search utilities. Click any category to expand the selection. The first option offers an automated search tool, while the remaining options offer additional resources if needed.
Heimdall Application Dashboard is a dashboard for all your web applications. It doesn't need to be limited to applications though, you can add links to anything you like. Some recognized applications can have their APIs accessed if you enter credentials. Recognizes other applications for the purpose of search and autocomplete. Written in PHP, uses SQLite as its datastore.
All of these Mastodon instances are nice and pleasant and don't tolerate bigots and similar kinds of shit.
Documentation and Test Consoles for Over 500 Public APIs
A directory of known Arduino shields.
A modern directory of online BBSes.
Free and open source software for Windows XP and Vista.
An open-source command line utility for *nix that lets you manipulate a Windows Active Directory. You can create and manipulate accounts and groups, modify attributes, and more.
An online directory ('zoo') of all of the known quantum algorithms that have been devised so far, their operational parameters, and uses.
A very large and periodically updated directory of cyberpunk related resources on the Net. You'll find forums, discussion threads, websites, music, projects, blogs, and more.
AlternativeTo.net's collection of self hosted webapps.
A wiki page of street medic orgs and collectives.