Open Source Software Library

Mattermost is an open-source, self-hostable online chat service with file sharing, search, and integrations. Designed as an alternative to Slack, it was founded by a Canadian-led team and is widely used by enterprises and governments for secure communications.

Pidgin is a free and open-source multi-protocol instant messaging client. Canadian open-source developers have long been contributors to Pidgin and its underlying libpurple library, which supports dozens of chat protocols.

A federated homeserver for the Matrix open communication protocol.

A web client for secure, decentralized Matrix messaging and collaboration.

A team chat system that organizes conversations by topic within streams.

A self-hosted communications platform for chat, voice, video, and customer engagement.

A low-latency encrypted voice chat application suitable for communities and gaming.

Lightweight Matrix client with a modern web interface.

Open-source chat platform with servers, channels, messaging, and self-hosting.

Collaborative workspace combining team messaging, files, tasks, and calendars.

Audio, video, chat, and collaboration app for Nextcloud.

Scalable XMPP and messaging server supporting chat, presence, and real-time communication.