Zulip is a 100% open source project built by a vibrant community of over 1,000 developers from all around the world. You’re able to self host Zulip or use the cloud version unlike other team chat software. Zulip has over 90 native integrations and 100 more available through Zapier and IFTTT. Users can also build their own integration through Zapier’s API. Threading is one of Zulips most powerful features.
You can download from the below link.
[ Ссылка ]
