does there exist something like yahoo answers that I can host myself?

I'm looking 开发者_如何学JAVAto make a alternative to wiki-type documentation for a program I use (http://reaper.fm). the wiki isn't maintained well and I think a database of "how do i _ in reaper?" would be much more effective. even stackoverflow itself is nearly what I'd be looking for. open source would be nice because I'm just doing this to help myself and others learn how to use reaper, but if it's not then maybe I could get a few enthusiasts to pitch in.

Maybe you should direct your users to use one of the many StackExchange sites for any questions related to your application. The ethos of the StackExchange family is that there doesn't need to be a separate forums etc. for each technology out there.