Hi Mathias,
Am I the only one wondering where a Donate option is? I searched the forum, the website en program options, but I can't seem to find it.
So my first suggestion is to
integrate a PayPal Donate button in the website and/or in the program's Help menu.
You must have fixed/returning costs like hosting, power for your PC(s) and all the keyboards you wear out typing code
What a great program, keep up the good work!