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Re:Please don't use Slack for FOSS projects by at-fates-hands on Monday February 01, 2016 @01:09PM (#11013761)
There were several listed in the comment section including:

Matrix (as someone with the project has already replied to your comment)

Zulip

Mattermost

LetsChat

RocketChat

Re:Please don't use Slack for FOSS projects by akerro on Monday February 01, 2016 @01:21PM (#11013887)
http://mattermost.org/ is good. We will use it in our company with 300 devs.
Re:Please don't use Slack for FOSS projects by at-fates-hands on Monday February 01, 2016 @01:25PM (#11013939)
Thanks for the heads up. I'm going to try this out. I have a small team of developers right now and Slack hasn't been working out as well as we had hoped.

I also noticed a lot of the comments recommended Mattermost as well.

Re:Please don't use Slack for FOSS projects by it33 on Monday February 01, 2016 @04:02PM (#11015407)
Fantastic!

Anyone interested, you can find Mattermost install guides here: http://www.mattermost.org/installation/

Puppet, Docker, Cloud Foundry, Heroku, plus guides to install directly on Ubuntu, Debian and RHEL/CentOS/Oracle Linux, etc.

Forums available for any help getting started beyond docs: https://forum.mattermost.org/