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Zulip
open-in-new
<p>Zulip is an <a href="/facts/Open_source/7X9rCdz4">open source</a> <a href="/facts/Online_chat/UXwSoP4j">chat</a> and <a href="/facts/Collaborative_software/YFaMuQdA">collaborative software</a> created by Jeff Arnold, Waseem Daher, <a href="/facts/Jessica_McKellar/Wu0LypC7">Jessica McKellar</a>, and Tim Abbott in 2012. Today, it is one of the free and open source alternatives to <a href="/facts/Slack_(software)/I51UWn6j">Slack</a>, with over 60,000 commits contributed by over 1000 people. </p>