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Technically Mattermost is very interesting. Unfortunately I cannot figure out their licensing scheme and business model. The license file mentions several licenses: AGPL, Apache 2, and the MIT license. They seem to apply separate licenses to binaries that they publish vs the open source repository. Is there an implied open core business model somewhere? How do I know when Mattermost Inc will show up and demand money for a proprietary license because I've misinterpreted what parts of the mattermost software is AGPL licensed?

https://github.com/mattermost/platform/blob/4ae72ad1a878fdf1...

Why not ask them to clarify?

Mattermost is explicitly a self-hosted solution. Their license does not appear strange to me; you can either use their builds, or build from source and adhere to the AGPL.

The android client is very annoying to use as it doesn't follow the standard android UI guide lines. Can't swipe in the menu etc.

Yup, been looking into it the last couple of days because Slack is devilishly slow in China, and it seems to cover most of the stuff you'd want from slack plus the things GP mentioned. Really cool stuff.