Quipper is a free tool for creating quizzes to be taken on iPhones, on Android tablets, and on Android phones. Quipper quizzes are multiple choice activities created by the community of users. As a Quipper quiz creator you can make your quizzes public or private.
When you create a quiz on Quipper you can include explanations for each answer. To create a quiz you can write each question and answer choice manually or you can import a spreadsheet of questions and answers. If you decide to try Quipper, keep in mind that quiz publishing isn't instantaneous.
Videoscribe is an IOS app that lets you or your students create presentations that look as though they are being hand-drawn right in front of you. You've probably seen this style of animation recently, (like this from Sir Ken Robinson) they've become quite popular.
"Generate printable QR mobile phone-readable 2D barcodes containing a website URL, an email address, a phone number, a pre-formatted SMS message or just plain text to use as paper prints, DIY stickers, temporary tattoos or iron-on T-shirt transfers."