3. Google Slides
For those who prefer a conventional slideshow app, Google Slides is a simple, no-frills alternative. It lacks some of PowerPoint’s advanced features and effects but it has at least two things going for it: as part of the Google Drive online application suite, Slides is free and it offers several useful collaboration tools, such as the ability to share and work on slideshows with others.
Slides is also included in the Google for Work suite for businesses.