Record my desktop 
Record my desktop is a small, lightweight software, and simple to use. But it is very practical for recording the video from the desktop, and this includes the recording of sound as well. This software has primarily been written for Linux. It also has two separate parts - the command line tools, which perform the task of encoding and capturing; and an interface that can expose the program functionally as well as graphically. Record my desktop has two types of frontends that were written in python - using pyGtk or the gtk-recordMyDesktop, and the pyQt4 or the qt-recordMyDesktop. 
 
Why you must get it: 
Record my desktop can be installed and used easily. It is basically run from the command line. However, the developers have put some work into its graphical interface. One of the greatest advantages is that the user will be able to encode the video and audio with the help of an ogg container. The images are encoded in Vorbis and he software uses theora sound, which is lossy. The program is smart enough to record only the part of the screen that has been changed, which helps with keeping computing resources in check. This software also allows recording the audio through A ISA, JACK audio server, or the OSS. It has three important types of programs - the command line tool with the gtk-recordmydesktop, QT environments and the qt-recordmydesktop as a graphical front ends for the GTK.