Open source alternatives to Skype

Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.

Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.

Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.

Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.