Prezi is a nice alternative to more traditional presentation tools such as Google Slides and MS PowerPoint. Free accounts have very limited space and your work is public and cannot be make private. However, you can get an education account as long as you have a email address with the same domain name as your school. Sign up here for an Edu account. You get 500Mb space and your Prezi's are private by default. There is also an app in the Chrome Webstore. Been using it on my Chromebook - works well. You can have up to 10 people working on the project at the same time - bit like a Google Slide presentation.