Comments from those who selected it as one of their Top 10 Tools in 2008

• " A Dynamic Mathematics program, I am using it to plot functions, and create animated science work sheets and interactive content for Maths and Science. It is excellent and licensed under the GPL, there is a reasonable amount of documentation for it and examples abound on the internet. Just Google Geogebra. It creates Java applets that interact with your students."  Mike Halls
• "Great maths tool. Graphing, equations, pythagoras, area etc, this is excellent free software with a corresponding help wiki that contains many excellent lesson ideas "  Jason Denys