I was lucky to meet a guy who is running a company that id working on an extremely polished alternative, called Edubase. (I’m not affiliated.)
It seems both the students and the teachers love it. And I can see why. He demoed it to me and for example for Math exams it supported equivalent form solutions. That’s definitely not the trivial kind of stuff. And the list went on, both the capabilities were off the chart and the user experience was top polished. It’s already used on universities and in some private companies. Definitely check it out if you need a solution from the space.