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edX can automate short essay grading with edx/edx-ora2 "Open Response Assessment Suite" [1] and edx/ease "Enhanced AI scoring engine" [2].

1: https://github.com/edx/edx-ora2 2: https://github.com/edx/ease

... I believe there's also a tool for peer feedback.

Peer feedback/grading on MOOCs is pretty bad in my experience. There’s too much diversity of skills, language ability, etc. And too many people who bring their own biases and mostly ignore any grading instructions.

Peer discussion and feedback are useful in things like college classes. Much less so with MOOCs.

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