CamStudio is a free and open-source screen capturing software for Windows. With CamStudio you can record video from your computer screen and save it with the .avi file extension, which is supported by most video players and video editing software. CamStudio also allow you to add subtitles and screen captions or video annotations to your recordings through anti-aliased images. All recordings made with CamStudio are captured with a lossless codec that produces crystal clear results with a much smaller filesize. CamStudio is used by creators who wan't a free, capable alternative to commercial screen capturing software.