Zulip
Enterprise open-source team chat, on-prem and in the cloud. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.
Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Zulip topics create a separate space for each discussion, so different conversations will never get in each other's way. Teams of all sizes rely on Zulip - Fortune 500 companies, open-source projects, startups, and many others. Zulip is 100% open-source enterprise-grade software, self-hosted or in the cloud. Try it today!