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There's a few. One's Mattermost: https://about.mattermost.com https://about.mattermost.com My company has been using it for a while.

• fairpx 9y ago
  We'd love to contribute (with design). Are you aware of anyone interested in collaborating. We're looking for something that we can use ourselves and thus contribute to crafting a better experience around the software.
  • the_common_man 9y ago
    Definitely, rocket.chat. It's a proper opensource company and their mobile app could use a lot of love.
  • it33 9y ago
    Hi @fairpx, Mattermost team here, we'd love to have your help! Here's a page to learn about all the ways the community can contribute: https://about.mattermost.com/contribute/ https://about.mattermost.com/contribute/