5 Best Open-Source Zulip Alternatives (2026)

Zulip: open-source team chat organized into topic-based threads. Of the 10 alternatives we track, 5 match the "Open source" filter. Mattermost is the closest match, sharing 100% of Zulip's tracked attributes. Every option links to its own alternatives, so you can keep exploring.

Last reviewed October 19, 2026 · 5 alternatives