EAGLE (for: Easily Applicable Graphical Layout Editor) by CadSoft Computer is a flexible, expandable and scriptable EDA application with schematic capture editor, PCB layout editor, auto-router and CAM and BOM tools developed by CadSoft Computer GmbH, Germany, since 1988.
EAGLE is popular among smaller design houses and in academia for its favourable licensing terms and rich availability of component libraries on the web, it contains a schematic editor, for designing circuit diagrams. Parts can be placed on many sheets and connected together through ports.
The PCB layout editor allows back annotation to the schematic and auto-routing to automatically connect traces based on the connections defined in the schematic.
EAGLE saves Gerber and PostScript layout files and Excellon and Sieb & Meyer drill files. These standard files are accepted by many PCB fabrication companies.