Kdenlive

Wiki says: Kdenlive (KDE Non-Linear Video Editor) is a free and open-source video editing software based on the MLT FrameworkKDE and Qt. The project was started by Jason Wood in 2002, and is now maintained by a small team of developers.

Kdenlive packages are freely available for LinuxFreeBSD, and Microsoft Windows, and the source code is available under the terms of GNU General Public License version 2 or any later version.