Rocket.Chat
Open-source communication platform for secure team collaboration, customer engagement, and mission-critical operations with on-premises and cloud deployment options.
Rocket.Chat is an open-source alternative to:

Rocket.Chat is a secure, open-source communication platform that centralizes real-time messaging, voice, video, and AI capabilities for teams and organizations. Designed for mission-critical operations, it offers robust data privacy, sovereignty, and compliance features.
Key Features
- Unified Communication: Real-time messaging, voice and video calls in a single platform
- Multi-Environment Deployment: Cloud, on-premises, or air-gapped environments
- Data Privacy & Sovereignty: End-to-end encryption, access controls, and compliance features
- AI Integration: Privacy-first AI capabilities for workflow optimization
- Cross-Organization Collaboration: Secure communication across teams and external stakeholders
- Governance & Monitoring: Complete messaging governance and audit trails
- Integration Hub: Connect tools, custom apps, and processes into one platform
- Accessibility Compliance: WCAG 2.1 Level AA conformance for regulated procurement
Tech / Self-Hosting
Rocket.Chat is fully open-source (MIT license) and can be self-hosted on any infrastructure. The platform supports Docker, Kubernetes, and traditional server setups. Enterprise-grade security features include SSO, 2FA, and granular permission controls. Documentation and developer guides are available for custom deployments and integrations.