Empressr is a neat alternative to PowerPoint that can be embedded and used online! It's got some neat tools and fairly simple to use. I would use it as a model for students to create presentations to share with the class. The best part is that the partners or group members can work on it at home and not have to email each other back and forth that one copy of PowerPoint.
The example I made below are just photos I took while in Paris and I labelled them for the students. This way we can look at the popular places in Paris!