Below are some of the software projects I’m involved in:

The Psi XMPP client. Since August 2004 I’ve been the project leader for Psi, one of the most popular Jabber/XMPP clients. This is where the majority of the time I spend in the open-source world is spent.
SleekBot SleekBot is a bot framework for Jabber/XMPP written in Python which makes it easy to write bots for conference rooms. SleekBot also has an eggdrop compatability layer allowing users to run Eggdrop TCL scripts for IRC in their Jabber/XMPP MUC/conference rooms (many scripts run unchanged already).
Mac Ace Updater a Mac OS X application for managing/updating/installing Ace addons for World of Warcraft.
MaybeLater a Getting Things Done inspired task list system, written in Python on the Django framework with an XMPP/Jabber interface.
Eps_ind a reasonably swift calculator for the eps_ind metric (source only).

Some more projects where my involvement is more marginal:
The SleekXMPP XMPP (Jabber) library, written in Python.