...(Often called Audience Response System, Classroom Response System or simply Clicker)
For Docents:
Easy to use and works out of the box on every machine. Create your Questions prior to your lecture. Evaluate the voting during the lecture or in depth afterwards.
For Developers:
Plugins for third-party-hardware can be easily created by implementing three simple Interfaces.
Requirements:
Java 1.5+
Recommended:
Java 1.7
A first beta-test with approximatly 65 Students can be viewed under the following link:
http://youtu.be/Cm9ufuvc9z0
It is currently being used at the University of Hamburg in Softwareengineering 1 with more than 300 Students