Charts Factory - Create simple charts super fast and for free!
Zeetings - Turn your presentations into interactive conversations
ZingChart - ZingChart is a fast, modern, powerful JavaScript charting library for building animated, interactive charts and graphs. Bring on the big data!
Mentimeter - a web-based polling tool for workshops, conferences & events
Google Charts - Interactive charts for browsers and mobile devices.
SlideLizard - Powerpoint plug-in for live audience interaction