[Karunamon]

Unfortunately Hipchat won't work for my day job because the higher ups have this thing against hosted services (and given the security climate nowadays I can't entirely blame them).

Any idea of something like Hipchat but hostable internally?

[nso]

Let them know you'd like a self-hosted version: https://www.hipchat.com/firewall

This one looks like a carbon copy of hipchat, but I have no experience with it: http://kikuchat.com/