MediaFork is a GPL’d, multiplatform, multithreaded DVD to MPEG-4 ripper/converter, available for Mac OS X, Linux, and Windows. It is based on the source code to HandBrake
has everything you need to take your story from concept to production. Celtx replaces 'paper, pen & binder' pre-production with a digital approach that's more complete, simpler to work with, and easier to share.