QA Site Like on StackOverflow Hosted on Google App Engine: OSQA or Alternatives?

view story

http://serverfault.com – Some friends and I have a business GAE instance and wanted to roll our domain-specific QA site like StackOverflow for people using a couple of projects we do. I am quite generally looking for alternatives. Important: Must be hostable on GAE F/OSS preferable Authentication would mean private only; no interested in re-inventing a website like SF/SO. Have the basic voting scheme: upvotes, downvotes, give me popular issues. Do Not Really Care About: How close the interface looks like/cheats from SA Pluggable into any other social services, this will be closed to my team and those we invite (HowTos)