The format should be consistent with whatever citation style you’re using, or do I miss the point of your question? If you want a title, something like ‘FluCoMa discussion board’ should suffice: the critical point of URL citations is just to get the URL right (and, of course, provide a last visited date if your style demands it). If you’re citing the whole board, then authorship is probably the FluCoMa project. If you’re citing a post, then the authorship is the post author (meatworld name if published, username otherwise).
As for citing the tools: sometimes it will make sense to cite the software directly rather than a position paper. Once we’re fully public, the codebase will get a versioned Digital Object Indentifier (DOI).