PFsysinfo: Info on PF firewall via web browser. Works with PF on OpenBSD and FreeBSD.
Desktop Manager: Open source, GPL’d, virtual desktop app for Mac OS X. It has a few quirks, but it is very fast.
DokuWiki: Wiki clone that just uses plain files (no database) to store pages.
SSH Agent: GUI front end for SSH Agent on Mac OS X.
Fire: IM client for Mac OS X that supports AIM, ICQ, irc, Jabber, MSN and Yahoo Messenger.
Colloquy: IRC client for Mac OS X. How do you pronounce that?