Open Source Alternative Finder
Discover high-quality, self-hostable open-source alternatives to popular proprietary tools.
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Mattermost
Alternative to Slack
mattermost is a free, self-hostable open-source alternative to Slack. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. It is primarily written in TypeScript.
Rocket.Chat
Alternative to Slack
Rocket.Chat is an open-source communications platform with channels, omnichannel, and federation.