One amazing example that I have been using was Nearpod. Nearpod allows 100% student engagement and participation. It allows teachers to embed videos, activities, virtual videos, collaboration board and assessment at the end of the session.

It enables teachers to follow up of students work and check who is working and who is not. At end it also generates a report showing individual student performance in every task as well as their overall participation percentage.

I honestly don't know how I could have possibly been able to teach virtually for a whole year without it.

I also liked the features in Scholar so much and how diverse it is and the level of social interaction it provides but I ahven't actually tried it professionally with my students yet.

Link to Nearpod: 

http://nearpod.com