Private, open source Slack competitor Mattermost today closed a $20 million funding round to help members of its community create new plugins and integrations.

The news comes a day after and .

Mattermost has shaped itself in the image of Slack: Like the real-time workplace messaging app, Mattermost began as a provider of communications for gamers, CEO Ian Tien told VentureBeat in a phone interview, but was later sold as a team communications service to

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