CamStudio is able to record all screen and audio activity on your computer and create industry-standard AVI video files and using its built-in SWF Producer can turn those AVIs into lean, mean, bandwidth-friendly Streaming Flash videos (SWFs)
Version 2.5 beta adds recording a region by windows, mouse-button-based visual feedback, true multilanguage support, recording audio from speakers, and a variety of other new features and fixes.
Formats:
AVI - XviD/DivX/3ivX
Macromedia Flash - SWF
Macromedia Flash Video - FLV
Windows Media - WMV
Quicktime - MOV
Real Media - RM
Executable - EXE
Animated GIF
CamStudio20 (Old version) - Download now
Another url: http://camstudio.org/ (inc. Codecs)
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Credit: download.com