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Freedom Tech | 1 months ago (raw) | root | parent | reply | flag 
 That's one I haven't heard of. Is it owpe source?
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ContrarianAgrarian | 1 months ago (raw) | root | parent | reply | flag +1 
 I hadn’t heard of it either but looks like it is 😃

https://github.com/zulip/zulip#readme