C.a.R.
C.a.R.– Compass and Ruler — is a free and open source interactive geometry app that can do geometrical constructions in Euclidean and non-Euclidean geometry.
The software is Java based.
The author is René Grothmann of the Catholic University of Eichstätt-Ingolstadt.
It is licensed under the terms of the GNU General Public License.Assignments make possible to create Java applets, for a construction exercises.
These applets can be used from the command line using the AppletViewer.
