Cinelerra is a video/audio editing and creation application similar to commercial proprietray programs used in the movie industry. Cinelerra does primarily 3 main things: capturing, compositing, and editing audio and video with sample level accuracy. If you want to make movies, you just want to defy the establishment, you want the same kind of compositing and editing suite that the big boys use, then it's time for Cinelerra.
PiTiVi allows users to easily edit audio/video projects based on the GStreamer framework. PiTIVi provides several ways of creating and modifying a timeline. Ranging from a simple synopsis view (a-la iMovie) to the full-blown editing view (aka Complex View) which puts you in complete control of your editing.
Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs. Tasks can be automated using projects, job queue and powerful scripting capabilities.
Kino is a very popular video editor that allows you to record, create, edit, and play movies recorded with DV camcorders. This program is fairly easy to understand and uses many keyboard commands for fast navigating and editing inside the movie.