C.a.R. is dynamic geometry program. Basically, it simulates compass and ruler constructions on a computer.

But on a computer, much more is possible.

C.a.R. works on all modern platforms. The user interface of C.a.R. has been translated in many languages. C.a.R. can be used free of charge, and the source is available under the Gnu General License. The official version of C.a.R. is on Sourceforge.

The program comes with an extensive documentation, a help system inside the program, and numerous example constructions.