most of them don't even have a GUI
Don't let yourself be fooled, that does not mean it's not interesting or useful.
Most of the stuff I work with are windows services, the only interaction with the are the management console or the log files, but still quite interesting stuff.
oftware for medical training with a database of questions and answers of common diseases
I believe actually creating the questions with possible answers is the hardest part and it can be really time consuming. But I wish you good luck.