by Mattermost Inc.
Open-source, self-hostable team messaging and collaboration platform.

Mattermost provides channel-based messaging, playbooks and integrations that organisations can self-host for control over their data.
Team messaging organised into channels with integrations and huddles.

Secure messaging and collaboration built on the open Matrix protocol.
Voice, video and text chat for communities and friends.

Chat, meetings and collaboration in Microsoft 365.
Yes. Mattermost can be used for free (pricing: Free, Freemium, Subscription).
Mattermost is available on Windows, macOS, Linux, Android, iOS, Web, Self-hosted and Docker.
Yes. Mattermost is open source under the GNU AGPL v3 license.
Mattermost is developed by Mattermost Inc..
The top-ranked alternatives to Mattermost are Slack, Element and Discord. There are 4 alternatives in total, ranked by community votes, shared features and platform fit.
Mattermost is listed under Communication. Open-source, self-hostable team messaging and collaboration platform.
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