Mattermost

Mattermost is a communication tool for team communication. In its own words: Accelerate your mission critical workflow by integrating people, processes, tools and AI infrastructure on a resilient and adaptable platform.

What the free plan gives you

Free self-hosted edition.

Because Mattermost is open source, the ceiling is your own infrastructure rather than a billing page. Self-hosting costs nothing but your time, and a hosted plan is there if you would rather not run it.

What it does

Mattermost covers adaptable, focused, secure, resilient, self Sovereign Collaboration.

When you would pay

You may never need to. The free tier is not a funnel step here, so the sensible move is to use it until something it genuinely cannot do forces the question.

We list Mattermost because the free plan was checked against its own pricing page, not because a vendor asked. If it has changed, tell us and we will re-check it.