Studyr

After many months of work I was finally able to launch the app.

The feature set at the moment looks like this:
Complete enrollment management with terms, courses, homework, and gradings. Support for repetitive and MWF classes, including attendance tracking. The calendar shows you all the study data, not only your classes. Switch easily between month and week mode. Your calendar can also be shared with Google Calendar, Outlook, Apple Calendar or any other 3rd party app which supports the .ics format.

Create homework and gradings with full support for repeating occurrences. Use filters to easily see what's important right now. Customize the grading scale to your needs and have all your marks and course averages at hand, including GPA.