Software

USBPcap
I am the creator of USBPcap - USB packet capture for Windows

Rockbox
I am core developer (have commit access) of open source firmware for mp3 players. I have ported Rockbox to the Sandisk Sansa Connect player.

QTScrobbler
I am the creator of QTScrobbler - a tool used for submitting .scrobbler.log from portable players to Last.fm.

griv
I've resurrected griv - serverless LAN chat application.

Audacious
I am also member of atheme.org. I have done various improvements to Audacious.

cdemu-tray
I am the creator of simple cdemu client

gdigi
I am the creator of gdigi - tool to control Digitech guitar pedals

Other

I've done some minor work for:
KVIrc - free portable IRC client based on Qt GUI toolkit.