TalkingDeck - With TalkingDeck you can create instructional videos from Google Slides presented by our animated characters.
SlidesWhiz - Better shortcuts and toolbar for Google Slides
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.
Slideflow - Turn your Google Slides into a website in seconds.
SlidesPPT - Beautiful free presentation templates for Google Slides
Ludus - Limitless creativity for your slides.