💬 Best Open Source Communication Software

Discover the top 5 open source communication tools. Expertly reviewed, free, and self-hosted alternatives to enterprise solutions.

Secure team collaboration platform. Channels, threads, integrations, and playbooks.

Alt: Slack, Teams, Microsoft Teams, Cisco JabberGo

Self-hosted newsletter and mailing list manager. High-performance with a clean interface.

Alt: Mailchimp, ConvertKitGo

Open source team communication platform. Messages, video calls, file sharing, and omnichannel.

Alt: Slack, Teams, Discord, Pumble, Chanty, Microsoft TeamsTypeScript

Secure decentralized messenger built on Matrix. End-to-end encrypted group chat and calls.

Alt: Slack, Discord, TeamsTypeScript

Open-source team chat with topic-based threading.

Alt: Slack, Microsoft Teams, DiscordPython