Creating Screencasts/Software

Windows

 * ActivePresenter Free proprietary screencasting tool with free edition available.
 * CamStudio free, open source screen recorder
 * Capture Fox plugin for Firefox
 * Wink for making small, animated, flash tutorials
 * Camtasia Studio proprietary screen recorder

Mac

 * iShowU
 * Snapper
 * Copernicus (video only, no audio)

Linux

 * XVidCapture
 * recordMyDesktop
 * Istanbul

Cross Platform

 * screencast-o-matic.com browser based screen recorder that uses Java
 * Jing (Windows, OSX only)