Padlet - Visual boards for organizing anything.
SlideLizard - Powerpoint plug-in for live audience interaction
Popplet - Popplet is the simplest application to capture and organize your idea.
Pingo - Optimize images for the web quickly 🖼️⚡
Quiver - Quiver is a notebook built for programmers.
Imakiku - Imakiku is an audience response system for real-time voting, posting comments, and surveying.