A: I have several, but let's just start with Paper by Fifty-Three, a beautifully-designed freemium* app that can be used by teachers/students to support a variety of learning tasks in the classroom. Paper's versatility derives from its simple-to-use journals, in which students can write, draw, and/or brainstorm ideas. It also allows students to export their work to Google Drive for storing, sharing, or further app-smashing. Please take a look at the brief demo below for an example of its potential use in your classroom.
*Paper is free with an in-app option to purchase an expanded tool-set (e.g. paintbrush, pen, marker)