hitobito VS Easy!Appointments

You could have a look at https://github.com/hitobito/hitobito for some features. Not sure if the community language is English or German, but nay be worth asking directly

But I would also rather suggest going with a Docker image. The hitobito folks also has some documentation but most is in German in case that's an issue for you. You can also ask me if you're stuck.

Not sure if this is a perfect fit, but there is an open source software to manage communities called hitobito: https://github.com/hitobito/hitobito

I found this one, but I don't know what it's worth it? easyappointments.org ( feel free to remove if it breaks the community guidelines )

https://easyappointments.org/ [I think the payments bit is customised, so contact the developer for this one]

EasyAppointments and Cal.com are both options.

From easyappointments.org :

If you *really* want to run it yourself, you can find open source equivalents (https://easyappointments.org/ is one). Running a server would still cost you $5-10/mo, plus your time.

https://easyappointments.org/ is another option but not sure if it does payments.

EasyAppointments is a good PHP option, still in active development I think