OGM

OGM meaning Ogg Media File, was developed by Tobias Waldogels. It is an advanced video format, which can do many things what obsolete AVI can't:

• subtitle tracks
• many audio tracks ([[MP3, AC3, Ogg Vorbis, WAV)
• chapters
• Ogg Vorbis audio support

Unfortunately OGM isn't open source although it is based to open source Ogg framework. It is anyway supported in Windows with OggDS (http://tobias.everwicked.com/) filters and in Linux MPlayer. It is clear that Matroska will beat OGM in long run, because it is multiplatform and opensource.