allows presentations to be uploaded to a free teacher account (PPTx or PDF and only 2 at a time) that can be viewed on any device when a presentation is live.
Wondershare lets you edit PDFs from a Mac. It is less expensive than the full version of Acrobat. A great classroom example came from an EdTechTeacher summer workshop participant. She created a Wordle, which she saved as a PDF. Then she inserted a QR code into it that linked back to additional information on her blog.