GitLab is gobbling up another project. They are open-sourcing it, so that is kinda neat. I’ve never used Gitter, because it was tied to GitHub. Any good?
They promised to release the code by June 2017. Noted at Add Gitter - NotABug.org: Free code hosting.
I’ve used Gitter some, and it’s pretty good. Definitely it’s good at what it does; a chat room tied to a repo.