[Coeur]

Nice. This obviously references https://doodle.com/ , which was super popular 15 years ago (in Europe), but then turned unnecessary complex, added intruisive advertisements and aggressive monetisation.

Would love to see a popular option that stays free.

[nikeee]

There was dudle [1] developed and hosted by a German university. Seems unmaintained, but there is an independent project called BitPoll [2].

[1]: https://github.com/kellerben/dudle [2]: https://github.com/fsinfuhh/BitPoll

[dschuessler]

https://crab.fit/ is an open-source solution. It has a different interface that is much more compact and convenient. I honestly love it.

[solarkraft]

This has been online for a good number of years. I think Framasoft have their own hosted version.

[7bit]

Well, follow the link and you can see it :)