YackPack

My team didn't create YackPack specifically for education, but that's where our service has found the most enthusiastic supporters.

I my own teaching at Stanford I like using the service to give feedback to students. So much easier than other methods.

I don't want to go overboard promoting YackPack here, but I wanted to add it to the mix. As instructors, we have so many great online tools to help us these days!