Mattermost

Open-source secure team collaboration platform for organizations with strict requirements.

PlatformWebAccount requiredfreemiumglobal

An open-source team collaboration platform that can be deployed on an organization’s own infrastructure, allowing chat and collaboration without storing conversations on a vendor cloud. It addresses concerns about external data custody and per-seat SaaS pricing, and is aimed at enterprises, government agencies, and security-focused teams that require self-hosted, controllable communication tools.

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