DrGeo: Dr. Geo is an interactive geometry application.
Download: DrGeo (12.04) (v.1204)
Dr. Geo is a winning award interactive geometry software for Linux, XO laptop, Windows and Mac OS X. Dr. Geo allows one to create geometric figure plus the interactive manipulation of such figure in respect with their geometric constraints. It is usable in teaching situation with students from primary or secondary level.
It is simple and effective with some unique features as scripting and Smalltalk programming.
Download and additional information at the new Dr. Geo home: http://www.drgeo.eu