Open Source Team Chat & Messaging Tools using Postgres
A curated collection of the best open source platforms for real-time team messaging, with channels, direct messages, threads, file sharing, and app integrations. using Postgres.
Team chat with email, tasks, and docs in one workspace
Stars
4,188Last commit
30 minutes agoLicense
AGPL-3.0
Team chat app with inline threads, mention-based sharing, a unified inbox for chat and email, and an AI agent that works across your full workspace.
Open Source Alternative to:
Team chat, project management, and AI agents in one place
Stars
32,063Last commit
28 minutes agoLicense
Apache-2.0
Workspace that combines team chat, project planning, and git management with AI agents that collaborate alongside your team on shared context.
Open Source Alternative to:
Secure collaboration platform for mission-critical work
Stars
38,978Last commit
58 minutes agoLicense
Unknown
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.
Open Source Alternative to:
Open source messaging with privacy and community focus
Stars
10,173Last commit
40 minutes agoLicense
AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
Open Source Alternative to:
Sent – Messaging Infrastructure for Developers. One API for SMS, WhatsApp, and RCS across 190+ countries.
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