I am interested in making an app that will allow people to set and see their schedule per day/week/month and would be great if it could provide a way for someone for viewing the schedule of all the employees. (Think about doctors setting their patients appointments and the administrator being able to see the whole schedules of all doctors).
I have found some libraries like this but the problem is that all of them come with either a subscription or a fee. Perhaps I am not using the correct keywords when I search for them. Any pieces of advice would be greatly appreciated.