Team Collaboration in WordPress

I'm trying to create a team collaboration tool on a WordPress site, basically like Slack (http://slack.com). I'm looking for somebody to be able to post a question/article/link/photo/document, then have a discussion around that-- essentially a discussion board with the first post of each thread highlighted. Except that once people create something useful (i.e. discuss revisions to an article and finalize it), I'd like the resource that the thread was about to be featured in a library of sorts. So basically, project collaboration discussions where the end results are all pulled together into a meaningful library.

I'm thinking of theming bbpress to do this-- anybody else know of plugins that function like Slack / what I described above?

Thanks.