Peer-correction / evaluation of homework
Peer evaluation (offline) is common in many universities and schools. 

It is beneficial for students to see what their peers have written and to learn from their own and their peer's mistakes and strengths. 

However, a well-formulated evaluation matrix would be necessary for objective evaluation. 

In my University, short papers are almost always evaluated by students themselves. There is blinding and we even attempted three independent, blinded evaluations and awarded the maximum marks obtained if and only if all the three evaluations were within 15% difference range. 

Hope this helps.