Ardour also supports various audio-for-video features, including video-synced playback and pullup/pulldown sample rates. The Adrour project has received financial support through the Google Summer of Code event, which will add additional advanced functions to the software.
The developer has recently released version 2.0.2 to fix an error in the source tarball released as 2.0.1. For "a brief practical introduction" to Ardor 2.0 see here. You can download the software here.