717
Easy to integrate with Excellent interface on multiple platforms Free
40
Github integration Free Markdown support
91
Open source Can be deployed on premise Faster than Slack
57
Open source On-premise deployment Free
86
Open source Great Community Extensive developer documentation
15
Threaded chat Simpler integrations than others, team inbox = awesome Great interface
14
Well-thought Design Work well with the rest of Office 365 work flow
4
18
8
Mobile friendly Email compatibility Easy to use
0
0
0
Easy to use Minimalist Integrations with CI servers etc
0
Free Github integration Bitbucket integration
4
6
Open source BYOS Docker, Vagrant, NodeJS
3
3
3
KBFS Encypted Git repos End-to-End encryption
11
2