Is Mattermost open source?

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Tags

1. #alternative
2. #cloud
3. #under
4. #binary
5. #react
6. #mattermost
7. #postgresql
8. #compiled
9. #mysql
10. #every
11. #source
12. #month
13. #private
14. #version
15. #linux
16. #written
17. #slack
18. #golang
19. #license
20. #single
21. #released
22. #https