I need forum software that gives the users the ability to rate posts built into it. I also need the software to arrange threads not chronologically, but by post popularity.

The end result would actually end up looking a lot like Yahoo! Answers. Does anyone know of forum software like this?

I’d prefer it to be written in PHP, but I’ll gladly use Ruby or Python. No ColdFusion or ASP. I don’t do the corporate stuff :p

I’ve just started a SourceForge project and they give you the option of hosting your project website on SourceForge. SourceForge does provide some CGI support (PHP, Ruby etc.) and I’d like to use a CMS or Wiki for my site but I don’t know which one’s will work with SourceForge. Ideally, I’d like a reference to some particular CMS/Wiki software and simple instructions on how I get it running on SourceForge’s web servers.