Mattermost, Inc.

1 Mac app on Kitsmith

Mattermost’s own site credits CEO and co-founder Ian Tien, who previously founded the gaming company SpinPunch and led product for Microsoft SkyDrive (now OneDrive) and Hotmail (now Outlook.com) before pivoting to build team chat.

website

Mattermost

Free limited-use evaluation edition (“Mattermost Entry”) for self-hosting; Professional, Enterprise, and Enterprise Advanced plans are all “contact sales” — no public per-seat price listed on the official pricing page

Open-source, self-hosted team chat — Homebrew’s own listing calls it exactly that: a “Slack-alternative.”

Utilities Screen Open source Homebrew Verified August 29, 2026

260 apps, every one checked by hand against the developer's own site or the Mac App Store — prices, requirements, and claims verified at the source.

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