### Mattermost
* Website : https://about.mattermost.com/
* Dockerfile : Yes
* Android app : [Yes](https://play.google.com/store/apps/details?id=com.mattermost.rn)
* iOS app : [Yes](https://itunes.apple.com/us/app/mattermost/id1257222717?mt=8)
* Language : Go, React 

### Zulip
* Website : https://zulipchat.com/
* Dockerfile : No
* Android app : [Yes](https://play.google.com/store/apps/details?id=com.zulipmobile)
* iOS app : [Yes](https://itunes.apple.com/us/app/zulip/id1203036395)
* Language : Python