SlidesPro - Google Slides add-on w/ shortcuts, YT videos & more
TalkingDeck - With TalkingDeck you can create instructional videos from Google Slides presented by our animated characters.
Slideflow - Turn your Google Slides into a website in seconds.
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.
Stickeroid for Google Slides - We help you to add stickers, clipart, logos into your slides
SlidesPPT - Beautiful free presentation templates for Google Slides