Kdenlive

Kdenlive is a non-linear video editing suite, which supports DV, HDC and much
more formats.
It main features are:
 * Guides and marker for organizing timelines
 * Copy and paste support for clips, effects and transitions
 * Real time changes
 * Firewire and Video4Linux capture
 * Screen grabbing
 * Exporting to any by FFMPEG supported format