D3.js - D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
Clikapad - ppvote software portfolio is a PowerPoint add-in that has been specifically designed to be used with CLiKAPAD audience response system hardware.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Imaginators - Create interactive presentations
Google Charts - Interactive charts for browsers and mobile devices.
Mentimeter - a web-based polling tool for workshops, conferences & events