Collaboration by Instapage - Landing page design collaboration for marketing teams
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.
Macaw - Macaw: The Code-Savvy Web Design Tool
SlidesPPT - Beautiful free presentation templates for Google Slides
Ludus - Limitless creativity for your slides.
WebSlides - Easily create great-looking HTML presentations.