A small service which indexes Tor hidden services by proxying for YaCy (which does the actual heavy lifting).

This is a module for Prosody that allows federation to other XMPP servers running as Tor hidden services. If you just want to set up a hidden service, you don't really need this.

A collective that's building F/OSS medical equipment. Presented at HOPE about torrenting drugs and medication. Their site has a tor hiddenservice, too: 4thievzv3hh26qeh.onion

OONI is a project for collecting and analyzing data pertaining to Internet censorship and surveillance around the world. The project aims to determine and chart just what measures are in place where and how effective they are.

Their source code reside in a Git repository at torproject.org.

The site is also accessible through this Tor hidden service: http://5m4rylprkig4swgg.onion/