GomPlayer is a free and easy open source player for Windows.
Features:
GOMPlayer supports most popular codecs (AVI, DAT, MPEG, DivX plus many more)
Plays Broken Files: Watch video files while you are downloading them!
Player Skins: If like to play with the look of your player you might like this one.
from the web site:
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.
Wax can create 2D & 3D special effects and can work in two modes – as a standalone application which would appeal for home users/beginners, and as a “plug-in” to video editors/NLEs which would be more useful for professional editors. Currently Wax can as a plug-in with Sony Vegas®, Pure Motion EditStudio and Adobe Premiere® and work for integrating with various other NLEs is in progress.
This looked to cool not to list.
Convert is an easy to use unit conversion program that will convert the most popular units of distance, temperature, volume, time, speed, mass, power, density, pressure, energy and many others, including the ability to create custom conversions.
for Windows only.
Just Free Software 