netgrowl.py is my implementation of the Growl 0.6 UDP network protocol, enabling to send notifications from Linux boxes to Macs
CocoaDev is a WikiWikiWeb site for and by the Mac OS X developer community.
The Safari Microformats plugin notifies you when the author of the website has published Microformats and allows you to easily import hCards and hCalendars in Address Book and iCal
Excellent descriptions for useful triggers.
Quicksilver Interface plugin
Open source alternative for running virtual machines on Os X.