PowerPoint Online alternatives

PowerPoint Online
Microsoft PowerPoint Online extends your Microsoft PowerPoint experience to the web browser, where you can work with presentations directly on the website where the presentation is stored. PowerPoint Web App is available for personal use in OneDrive, for organizations that have installed and configured Office Online on their SharePoint site, and for professionals and businesses that subscribe to select Office 365 services.
PowerPoint Online alternatives are:
Google Presentations, SlideRocket