QX11Grab is a system tray applet for X11 desktop environments that uses FFmpeg to recording X11 Desktops and Windows.
SimpleScreenRecorder is a Linux program to record programs and games.
vokoscreen is an easy to use screencast creator to record educational videos, live recordings of browser, installation, videoconferences, etc.
glc is an ALSA & OpenGL capture tool for Linux.
Yukon is a set of libraries and applications that are designed to capture realtime videos of OpenGL applications (games).