Nearpod is a great app for iPads, Nooks, and Android devices that can send content from the teacher's Nearpod app to the student devices. The app is free and is already on the Nooks on each campus in AISD. The new update to it lets the teacher send 'homework' assignments to the Nearpod devices, even when they are not actively connected. This feature is worth a look.
Very nice ability to share content, send student devices quizzes and see results on the teacher device, and more. You may want to give Nearpod a look.