Scheduling group meetings. I used to like Doodle, but they have descended down the Freemium path of obnoxiousness, so https://framadate.org/ framadate looks really nice -- and free-open intentions are written into their MO.
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@worldsendless I prefer when2meet:
@worldsendless unfortunately it's not open source.
@sojournTime I like the Frama conviction to open source, and being able to see their code at https://github.com/framasoft/framadate. Is when2meet libre?