The following is a listing of open source software projects that I am actively contributing development efforts to. My "serious business" username that I use for correspondence in the open source community is AJagucki, short for Armando Jagucki, my real name.
PEP in Openfire -- Personal Eventing via Pubsub (PEP) is a recent addition to the Extensible Messaging and Presence Protocol, the core protocol of the Jabber Instant Messaging network. Personal Eventing allows for a user's Jabber ID to act as a virtual publish-subscribe service enabling the user to publish notifications of event changes relating to their personal state. Subscribers to a user's PEP service can then be notified of information such as User Mood (how the user is feeling), User Tune (music the user is listening to), or User Geolocation (current geographical location of a user). This project's primary goal is to implement PEP in Openfire, a Jabber server written in Java.
Sonus -- An XMMS2 client written in Python. It uses PyQt4, which is a set of Python bindings for version 4.x of the Qt application framework from Trolltech.
GTA2SGE -- A save game editor for a classic PC game; Grand Theft Auto 2 by Rockstar Games. This application also uses Qt4, but it is written in C++.
TCPong -- Classic pong clone with TCP/IP network support. Uses the Simple Directmedia Layer, "a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer."
this -- As in, the subversion repository for the markup of this website here. Thanks to buchan for the initial source.