Haiku Deck is an excellent alternative to using Power Point or Google Slides to create presentations. Haiku Deck's themes, templates, and integrated Creative Commons image search tool have made it a popular tool in schools. Haiku Deck recently added a "share to Google Classroom" option that should make it easier for you and your students to share presentations with each other. Watch the video below to see how it works.
And if you're curious about how Haiku Deck works, check out the tutorial here.