“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”