Free Open-Source Programs
Here is a list of the open-source programs that I use the most. It's really amazing what is available, and what can be accomplished in an open, collaborative environment.
Inkscape, a scalable vector graphics (svg) editor
GIMP, an image editor
Blender, a 3d graphics application
Audacity, an audio editor
FlashDevelop, a source code editor for writing Flash programs
CamStudio, screen recording software
VLC media player, a multimedia player
AutoHotkey, a macro-creation and automation software utility
WikidPad, a Wiki-like notebook
Vim, a text editor
Cygwin, a Linux-like environment for Windows
R, statistical software
OpenOffice, an office suite
WampServer, Apache webserver, MySQL database, and PHP scripting on Windows
FileZilla, an ftp client
PeaZip, an archive manager