GeoGebra is a geometry teacher's lifeline. This free software is available for both the student and teacher of goemetry lesssons. Not only are there tools to build, measure and compare shapes but there are also great options for sharing projects. Teahcers can create assignments online that students can access in the library or where ever they chose to do theit studying. To take the networking a step further there are GeoGebra institutes to link local users into communities.

The event calander lists workshops and classes in various locations users are welcome to attend. The services provided on this site seem to be endless.