Zulip is an open-source team chat with topic-based threading, so you can follow streams & topics without endless scrolling. Self-hostable (Apache-2.0), used by Wikimedia & Mozilla. Alternative to Slack/Discord. openaltfinder.com/tools/zulip #opensource
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Zulip: Open Source Slack Alternative | OpenAltFinder
Open-source team chat with a unique topic-based threading model that makes it easy to follow multiple conversations.