Mattermost

What it is

Mattermost is a self-hosted messaging platform with channels and integrations, used by teams that need on-prem options and admin controls.

Key features

• Channels - Team channels, DMs, and threads.
• Self-hosting - On-prem/self-host deployment option.
• Integrations - Webhooks, bots, and plugin ecosystem.
• Administration - Role-based admin controls (edition-dependent).

Strengths

• Channels - Team channels, DMs, and threads.
• Self-hosting - On-prem/self-host deployment option.
• Integrations - Webhooks, bots, and plugin ecosystem.

Trade-offs

• Operations - Self-hosting adds upgrades, backups, and monitoring.
• Feature tiers - Compliance and governance features vary by edition.
• Ecosystem variance - Plugin quality and maintenance vary by plugin.

Pricing

Open-source software. Direct license cost is zero; costs are typically infrastructure, operations, and optional paid support or hosting.