Marvel for Keynote - Transform slides into interactive prototypes
SlideLizard - Powerpoint plug-in for live audience interaction
Sidekick - Email tracking plugin for Gmail.
Pingo - Optimize images for the web quickly 🖼️⚡
Snackwyze - Clickable walkthroughs from screen recordings in seconds
Imakiku - Imakiku is an audience response system for real-time voting, posting comments, and surveying.