InfuseLearning.com is an interactive tool for multiple devices. Students can use iOS, Android, and PC/Macbook devices. In many ways, InfuseLearning reminds me of Socrative.com with a few more bells and whistles. You can send pictures to students, and students can draw on the examples as a response to you. Your computer collects the data so that you can see each students' response. Like Socrative, it also includes multiple choice, true/false, and fill in the blank responses.
I have yet to try this version with an entire class. I have done some trial runs with a few students on their laptops just to see how things went. It is a little tedious for the students to draw with their laptops if they are not using a mouse.
If you are interested in attempting to implement it into the classroom, let me know. I will be happy to assist you.