SlidesWhiz - Better shortcuts and toolbar for Google Slides
Slidebean - Presentations that design themselves
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.
TalkingDeck - With TalkingDeck you can create instructional videos from Google Slides presented by our animated characters.
Tome - Tome is a tool for creating stories at work—whether it's about strategy, design, data, or a personal message.