Can you please recommend me some cool open source solution for reservation system?

Question

Hi, I looking for good solution of reservation system for example for language courses, that I could change as needed or improove some tunning :))

Answer 1

WordPress with learnpress plugin

Answer 2

mmm ☺ WordPress I did not take into consideration, but ok i Will check, thanks

Answer 3

Learnpress is fine, but it's very large plugin. I would like to have simply calendar where users can see open sourses and they only select and safe the most appropriate term.
So what do you think? Is there any other option to solved my requirements?

Thanks,

Ivan