The Wizer worksheet builder complements teachers’ experience and creativity by allowing quick creation of a wide variety of question types: open questions, multiple-choice, matching pairs, fill in the blank, fill on an image, tables, etc. 

Cam Scanner is a free app for your phone or tablet for scanning documents as pdfs.

The Math Learning Center provides several free math apps that include virtual manipulatives.

iMovie is a free iOS app that allows you to edit videos

Now that you've tried DoInk for your green screening needs, it's time to try the following advanced techniques: