Hydrogen is an advanced drum machine for GNU/Linux
Its main goal is to bring professional yet simple and intuitive pattern-based drum programming.
MythTV, Open Source DVR MythTV is a Free Open Source software digital video recorder (DVR) project distributed under the terms of the GNU GPL.
FlightGear is an open-source flight simulator.
t supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. Source code for the entire project is available and licensed under the GNU General Public License.