[LAU] Common DAW session save / import

Hey all, So I know a standard exists for Pro tools to save to a interchangeable format for import to Mixbus via a 3rd party software app. Forget the names. Point is, it would be awesome to be able to save basic sessions in Ardour and be able to import the track info, edits, etc, into say, Qtractor or Muse or whatever. What's out there per open source or proprietary solutions. Is this something that could be collaborated on in house so to speak? I use Mixbus for the most part. But for live recording on an older sony Vaio, it's just too much of a CPU pig! Qtractor is a 1st choice solution for me. After the session has been saved, it would be great to be able to import that session to Ardour / Mixbus. Lining up all track data manually is a pita! Thoughts? Work arounds? Other open source DAW's? Fanx! :) ~ Russell