I like that you can host it yourself. I'ld like to guide my company away from email+phone but it is a long way to go. And in Europe there are still a lot of concerns if you can't host something in your own environment.

I don't see any FOSS / paid modern solutions similar to slack, flowdock, scrollback, .. ready to be hosted in your environment. HipChat seems to be the only solution with a standalone server available. There are some open source competitors but they are far from production-ready. Am I missing something?