First off I want to thank you for developing this wonderful tool. I am a course instructor for Mathematics in my university in Germany and we are hoping to have STACK running on our central Moodle server soon. We hope this would help us export our Mathematics assessments online, so we can more efficiently employ resources towards actual teaching and not marking homeworks all the time. We are really hopeful for this endeavour.
I am sure we will solve the GNUPlot issue on our central server; only my localhost is an issue. But nonetheless I can start with the development of the questions without the plots, since STACK and Maxima are running fine. Thank you again, I will then wait out for any updates on this
Thank you and a nice day ahead,