Geeky Open Source Software for Windows
Octave - Matlab clone (math programming)
scilab - Scientific software package
maxima - Computer Algebra, based on DOE Macsyma
Dia - Diagram editor, like Visio
The Gimp - The GNU Image Manipulation Program
Blender - 3D creation suite
Audacity - Audio editor
Celestia - Real-time space simulation
Contact Bill.
My PGP key.