MPlayerOSX will play almost all 3ivx, DivX 3,4,5 and other codecs files.
With Perian, the Swiss Army Knife for QuickTime...
Helps you get videos out of your Flip Video camcorder.
Powerful MPEG-1/MPEG-2 video converter for Mac OS X 10.2 or later It uses QuickTime...
See GIF Brewery in action at http://gifbrewery.com/ and http://helloresolven.com/portfolio/gifbrewery/.