Look for 'First Up' all dialog editing, SFX, and final mix done in Ardour or Mixbus. There are likely more than a few interviews etc on that page you would have to find with a similar story. Obviously I have worked there for several years now so who knwos what is there, we started using that channel regularly sometime after I got there.
Similar story.
All the video editing for these were done on FCP (Either 7/Studio or X) for reasons I laid out quite clearly in the thread on Lightworks. These are just samples, I have other stuff but no copyright clearance to release it, which I suspect you may find a not uncommon situation for many people working professionally doing audio or video editing for clients.
You can also look on Handturkey Studios, run by Jason Van Gumster for examples he has done which are done with a mix of FCP and Blender/FLOSS, depending on the project. Out of there you will find this...
http://www.youtube.com/watch?v=xCsMeNZ9bjs&feature=player_embeddedWhich the audio (Dialog Editing, SFX, and Final Mix) was done by me again on Ardour or Mixbus, don't remember which. I have a matching radio spot for them somewhere as well.
And of course you have the kickstarter video from Tube with a similar story, and the SFX for the teaser we did some time back as well.
One of these days I will get around to making a demo reel. This doesn't even touch on things I have done for my theatrical designs.
And there should be no shortage of material out there from demo reels and otherwise from Blender Artists, etc.
Seablade