SlidesWhiz - Better shortcuts and toolbar for Google Slides
SlideLizard - Powerpoint plug-in for live audience interaction
Slideflow - Turn your Google Slides into a website in seconds.
Pingo - Optimize images for the web quickly 🖼️⚡
TalkingDeck - With TalkingDeck you can create instructional videos from Google Slides presented by our animated characters.
Imakiku - Imakiku is an audience response system for real-time voting, posting comments, and surveying.