http://www.notconstructive.com/ "A place for the discussions not allowed on Stack Overflow"
Jeff Atwood, StackOverflow founder, frames Discourse as a complement to StackOverflow that focuses on discussion:
"At Stack Exchange, one of the tricky things we learned about Q&A is that if your goal is to have an excellent signal to noise ratio, you must suppress discussion.
After spending four solid years thinking of discussion as the established corrupt empire, and Stack Exchange as the scrappy rebel alliance, I began to wonder – what would it feel like to change sides? What if I became a champion of random, arbitrary discussion, of the very kind that I'd spent four years designing against and constantly lecturing users on the evil of?
But Discourse is just software for a forum, not itself a forum focused on programming.