A free program for Android, by miyaware.

Drawing Blackboard is an application that lets you draw on a virtual blackboard. Drawing Blackboard is a fun and easy way to express your thoughts in the form of pictures. If you’re looking for an application to draw a picture or write a poem, this app is perfect for you. You can select the color you want from a range of hues in the app using the color picker. Also, it offers a clarity feature that lets you see what you are creating. You can save your sketches using the save option. You can read what other people have written on the blackboard using the reading feature on the Drawing chalkboard.