Free DVD Authoring tool for MAC. Sizzle is a GUI/frontend for dvdauthor.
The x264 QuickTime Codec is a QuickTime Image Compression Component which uses the free, open source x264 H.264/AVC encoder. It can produce H.264 encoded video faster than the Apple-provided H.264, with more configurable options and better quality.
iSquint is an iPod/TV video conversion app for Mac OS X.
QTCoffee is a set of command-line Mac OS X utilities for manipulating QuickTime movies and other QuickTime readable media.