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Re:Spectrum is joining GitHub by pritambaral on Friday November 30, 2018 @01:45PM (#18571433)
> Zulip (open core)

Isn't Zulip fully open source? That's what they say on their site: https://zulipchat.com/

Re:Spectrum is joining GitHub by rishig on Friday November 30, 2018 @01:50PM (#18571484)
yup, Zulip is fully open source. I believe Mattermost is actually open core.
Re:Spectrum is joining GitHub by rst on Friday November 30, 2018 @11:16PM (#18575118)
Apparently so. I misread the website; their "Enterprise" support package offers better support, but no extra features.