With the free Web tool Sketchlot, you can create your “sketch” and share it with your students. They can then mark it up and send it back to you. Suggested for teachers and students ages 8-18, Sketchlot is a Web application, not an app, and requires no installation or plugins. It works on computers, smart phones, and tablets. You can sign up your students with class codes. Examples of use include creating math questions, science diagrams, and text through Sketchlot.