Video Converters

iSquint is an iPod video conversion app for Mac OS X.

Zamzar

Vixy

MPEG Streamclip is a powerful free video converter, player, editor for Mac and Windows. 

Video Makers 

http://animoto.com/

Celtx

http://www.celtx.com

Video Player

http://www.videolan.org/vic

Video Transcoder 

http://handbrake.fr

Flip4Mac