Virtual dub
A powerful freeware video editor with lots of features, including a choice of compression codecs, splitting, addition of audio tracks. Excellent.
http://www.virtualdub.org/
WAX
Wax is a high performance and flexible video compositing and special effects software. The idea for Wax is to be very general purpose and flexible in video compositing and effects, so that you can compose your dream video sequence with ease everytime.
http://www.debugmode.com/wax/
