I present you a project work from an University colleage and mine.
We finally got this project from our professor, because we completely hacked his former tool.
https://fh-math.server-plant.de
Due to this site is not officially certified by a regular CA, please ignore the SSL warning or please just add an exception for this site.
If you have any suggestions, questions or you are faced to a security issue, please contact me!
Of course you can also offer criticism and improvement suggestions.
Cheers,
Miau