1) Google Slides
Sharing your presentation has never been easier thanks to Google Slides. All you have to do is go to Google Slides, then either create a fresh presentation from scratch or upload your presentation and then generate a link that you can share with whomever you want to see the PowerPoint presentation you have made.
Making new presentations in Google Slides can yield great results, because it gives you the option of adding not only photos and words to your presentation, but audio and video content as well. The best thing about Google Slides is that you can directly talk to your audience using SlidesQ&A.
Google Slides is a part of Google Docs, an all-encompassing site that can replace just about any Microsoft Office program, including PowerPoint, to fulfill your computing needs even when you don’t have MS Office installed on your computer.
This unique and original presentation tool does not use slides like PowerPoint. Prezi tells your story on a single canvas with moving content appearing and disappearing off the canvas to create an interesting and very fluent presentation. The website allows you to take your PPT presentation and convert it into a Prezi if you want to try something new with your visual aids. You can also start from scratch and make a unique Prezi project to share.
3) Zoho Show
Make your presentations from scratch using the Zoho interface, or upload an already existing PowerPoint presentation and then either touch it up or just share it with your collaborators.