| C.a.R. | |
| Author: | René Grothmann |
| Latest Release Version: | 20.0 |
| Programming Language: | Java |
| Operating System: | Linux, Microsoft Windows, Mac OS X |
| Genre: | Interactive geometry software |
| License: | GNU General Public License |
C.a.R.– Compass and Ruler (also known as Z.u.L., which stands for the German "Zirkel und Lineal") — 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 (GPL).
Assignments make possible to create Java applets, for a construction exercises.These applets can be used from the command line using the AppletViewer.(Previously, they could be run in a browser, but Java support in browsers has been disabled in recent years.)