Atlassian HipChat (2017)

We used it for several years after our needs outgrew IRC. From the cloud version starting in 2013, we migrated to the hosted version in 2016, and it was a pretty painless migration and not too hard to manage/update. I think it stuck around for several years after that until the parent org moved everyone over to Slack Enterprise.

HipChat felt like a great featureset-to-complexity ratio. All-in-all good memories :)

First job out of school had me using Hipchat, so when I finally got a job that had Slack, it felt like bloated Hipchat. Didn't think about Hipchat for years until this post and I miss all the emotes/GIFs we used on it.