Freeware screen video recorder software for Windows:

• Freecorder 8. Comes with a bunch of other free goodies too, including video downloader, converter, torrent downloader, audio recorder and more. Recommended!
  
  Others:
  
• CamStudio
• Debut Lite
• BB FlashBack Express
• Freez Screen Video Capture
• Nbxsoft Free Screen Recorder
• Jing
• VH Screen Capture Driver
• Taksi (open source)
• Free Screen Video Recorder
• The last free version of ZD Soft Screen Recorder
• The last free version of AmaRecCo

Freeware online screen video recorder software (Windows/Linux/Mac OS/...)
I don't really like web-based screen recorders, because they limit your recording time plus they worked slower for me giving worse quality. But they are free, work on many platforms besides Windows and theoretically can be used from any computer where you can install Java 1.5 and a web-browser

• Screenr (Windows/Mac)
• Screencast-O-Matic (Windows/Mac/Linux/...)
• Screen Toaster (Windows/Mac/Linux/...)

Freeware cross-platform screen video recorder software (Windows/Linux/Mac OS/...)

• Krut
• vnc2flv