"Lightworks is the fastest, most accessible and focused NLE in the industry, because it is based on the simple idea that the editor, not the computer industry, knows what’s best. The latest release of Lightworks is based on the cumulative knowledge from twenty years of top-flight editing.
At the same time,, the Ubuntu version of Novacut has just been released. The quantum leap that Novacut makes is that it offers realtime collaboration. This feature alone has the potential to completely change the way we think about editing. As Christie Strong says on the Novacut blog:
"Novacut is not just a video editor, it's a revolution. An open source, collaborative, cloud-enabled platform that is created by artists for artists. The ambitiousness of the project, the passion of it's team and their commitment to the filmmaking community inspires me. They are thinking about the entire pre- to post-production pipeline and designing tools that empower storytellers and support the creative process from the ground up. If this is the future of filmmaking, sign me up!"http://blog.novacut.com/
In addition to these heavyweights, there are always the old faithfuls: Openshotvideo and PiTiVi