For quite a while Ubuntu had been including example-content packages with its releases that contained the same content: some audio and video data to test the playback, including a video of Nelson Mandela.
Ekiga, formerly known as GnomeMeeting, is an open source VoIP application with video support. The Ekiga project has recently incorporated major enhancements into its version 3.0 software.
The Jacklab Audio Distribution (JAD) 1.0 aims to offer what the media artist's heart desires, audio, video and imaging. And it aims to help users migrate from Windows.