SlidesWhiz - Better shortcuts and toolbar for Google Slides
Zeetings - Turn your presentations into interactive conversations
Slideflow - Turn your Google Slides into a website in seconds.
Crowd Mics - Crowd Mics provides solutions to turn phones into microphones for live events to boost audience interaction.
TalkingDeck - With TalkingDeck you can create instructional videos from Google Slides presented by our animated characters.
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.