This Chrome extension takes homework and test dates from PRONOTE and turns them into a study schedule. It fits sessions around your free time and uses due dates and difficulty to decide what comes first.
You can change study durations for each subject, move sessions around and set reminders. The schedule can be exported as an .ics file or synced to a separate Google Calendar.
Homework is stored in the extension. Google Calendar sync is optional. This project runs as an installed Chrome extension; it isn't a web app you can open from this page.