The University of Applied Sciences Erfurt has an online timetable: Publish
Each participant can arrange his own timetable view and also use it in his calendar.
On the main website, under "startsite > students > online services" you can find an explanation on how to use the software:
Please read the instructions first or download the ODF before you use Publish for the first time.
If you feel familiar with the application you can use it directly.