Scheduling software?

Question

Task Management

Hello.
Can you recommend a scheduling program?
There are several classrooms, teachers and groups. There is a lesson plan. I want to build schedules and distribute them to everyone in a different format.
It is desirable to export the results to something simple, so that later it would be easy to convert to html and word.
It is also desirable to support both a weekly schedule and long-running tasks (for example, every second Thursday of the month).