Discourse

[insert obligatory "This is old. Is something new?"]

That said, I hadn't checked Discourse's FAQ page in awhile, and I was wondering where it's been deployed as I couldn't think of many examples myself, other than Middleman's forum [1], but I don't actively check out sites' discussion boards. So it was cool to see that pretty well-known sites, such as BoingBoing and New Relic, are using it.

[1] https://forum.middlemanapp.com/

Their open source repository is full of interesting things to learn: https://github.com/discourse/discourse

The Atom editor has been using Discourse from the beginning. It works very (extremely?) well as a discussion forum but I turned off all mailing. I had problems controlling the topics sent.

The Discourse implementation of a mailing list is subpar. Many emails are delivered out-of-order or not delivered at all, the sender's email is not set in the from field, so you cannot glance at your inbox and see who replied to a thread and so many other issues. Google Groups is a far better alternative if you do not need open-source and need a mailing list that just works.

>"There's only one version of Discourse--the super-awesome-open-source one" >in the upper right there is a "Try It" button and a "Buy It" button

Well? Which is it?