Tiss_gcal is a project mainly written in JavaScript, it's free.
Greasemonkey-Script that adds links to simply create Google Calendar-Events from TISS-Dates
A simple Greasemonkey-script to add links to all sorts of events (class-, exam- and signup-dates) occuring within the Vienna University of Technology's online portal (TISS).
Requires Greasemonkey (http://greasemonkey.mozdev.org/)
Currently an alpha version.
Installation: