Fraps is not available for Linux but there are plenty of alternatives that run on Linux with similar functionality. The best Linux alternative is OBS Studio, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Fraps and 14 of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Fraps are SimpleScreenRecorder, VokoscreenNG, MangoHUD and Peek GIF Screen Recorder.
Krut is a screencast tool that is written in Java and well suited for making video tutorials (instructional videos) on most platforms. Krut records movie files, including sound, of selected parts of your screen. The files use the quicktime mov format.
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Istanbul is a desktop session recorder for the Free Desktop. It records your session into an Ogg Theora video file. To start the recording, you click on its icon in the notification area. To stop you click its icon again. It works on GNOME, KDE, XFCE and others.
