CAD software EAGLE

I make a mask pattern for the printed board by the handwork. The mask pattern can be automatically created with the computer with CAD(Computer Aided Design). A mask pattern for the printed board which is manufactured at the factory is almost made using the CAD. In my case, a lot of same printed boards isn't necessary. Also, I like to make a pattern to solve a puzzle. So, I didn't use a CAD tool.
On this page, I will introduce CAD tool which is named "EAGLE". This tool is released by CadSoft Computer, Inc. in Germany. There are an English version and a German version. I am using the freeware tool of the English version. I am while studying this tool. So, there seems to be some mistakes in the description. Also, all feature can not be introduced. The description contents are only the feature which I use. For the details, please refer to the home page of CadSoft Computer, Inc..

There are some feature limitations below in case of the freeware tool.
The useable board area is limited to 100 x 80 mm (4 x 3.2 inches).

Only two signal layers can be used (Top and Bottom).

The schematic editor can only create one sheet.

Above-mentioned limitation is not the limitation which has hinderance for me to use.

My site is linked from CadSoft Computer, Inc. as "The Hobby Electronics from Japan".