"Here are some of most widely used free and open source screencasting software applications that you should check out:
"XVidCap
XVidCap is aimed to be a standards-based, free and open source alternative to commercial applications such as Lotus ScreenCam and Camtasia. XVidCap works utilizing an on-line encoding facility with the FFmpeg libavcodec / libavformat. It can capture any movement on an X11 display either as single frames (like a number of JPEG images) or it can encode the captured frames to a video on-line. It can also grab and embed an audio recording provided users have an OSS compatible system and FFMPEG libraries with compiled audio capture support.
"Istanbul
Istanbul (named as a tribute to Liverpool's 5th European Cup triumph in Istanbul on May 25th 2005) is a popular desktop session recorder that works on on GNOME, KDE, XFCE and others. It records session into an Ogg Theora video file"
