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License
C.a.R. is open source by the GPL and free of charge. the GPL allows to change or modify the source, as long as the source remains open. Parts of the source may only be used in other GPL projects, and must be cited. Commercial applications are possible, but the source pages must be cited. You are welcome to distribute C.a.R. on CDs.
The Latex formatting in C.a.R. is based on code from HotEqn by VCLab Software. This code is under GPL too. The PNG saving code is GPL code by David Eisenberg.
Prerequisites
C.a.R. is a Java program and requires a runtime. It is essential to use the most recent Java version for your system. If the program does not start please update your Java version. I recommend to download and install the JDK from the following page.
The program will switch to your local language be default, even if you download the English packages below. For the German documenation you can refer to this web page.
Download and Installation
You can download the files from SourceForge (virus checked) only.
Get the the jar-file (zirkel.jar). Start the jar-file with a double click. This should work on all Java versions. If not start with the command java -jar zirkel.jar. You can create a batch file for this if you like, depending on your system.