Swift allows you to connect and chat with all your contacts on the fast-growing XMPP network, which includes Jabber.org, GMX, Google Talk, Google+, Facebook, and more.
Edo is a cross platform utilty application. It aims to replace a lot of small tools you have to use daily, like a network enabled notepad, RSS reader, audio player, IM client, and others.
xtalk is a multi-user IM/chat room system. It can be used to chat with other people within a colourful yet minimalistic command-oriented client.
A utility to program Logitech Harmony remote controls.
Graph drawing utilities with web and graphical interfaces.