The most innovative feature in Zulip is the ability to create topics (or tags) within a stream—the Zulip equivalent of a channel. This makes it possible to view incoming messages in a single chronological stream, as we were used to in Gitter. However, users can also tag each message with a topic and filter them in order to view all the individual messages belonging to one topic independently.
We hear so often about Slack, and even RocketChat, for this type of collaboration, but Zulip is also an excellent open source option, which is well worth consideration too.
See https://opensource.com/article/22/3/open-source-chat-zulip
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