Slides - Slides is a place for creating, presenting and sharing presentations. The Slides editor is available right in your browser. Unlike traditional presentation software, like PowerPoint, there's no need to download anything.
Slidebean - Presentations that design themselves
SlidesPPT - Beautiful free presentation templates for Google Slides
BaseTemplates - The easiest way to build your pitchdeck and raise money
WebSlides - Easily create great-looking HTML presentations.
SlideCamp - Library of PowerPoint slides to kickstart your presentation.