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.
Imaginators - Create interactive presentations
SlidesPPT - Beautiful free presentation templates for Google Slides
Mentimeter - a web-based polling tool for workshops, conferences & events
Ludus - Limitless creativity for your slides.
Slideflow - Turn your Google Slides into a website in seconds.