A glossy Matrix collaboration client for the web.
Element (formerly known as Vector and Riot) is a Matrix web & desktop client built using the Matrix JS SDK.
The Secure CommsOS™ for mission-critical operations
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Mumble is an open-source, low-latency, high quality voice chat software.
Synapse: Matrix homeserver written in Python/Twisted + Rust