EAGLE (Easily Applicable Graphical Layout Editor)

Cadsoft EAGLE is a freeware editing program used to design electronics circuit diagrams and printed circuit board (PCB) layouts. The program automatically starts off with all of the components required by the schematic. Components are manually arranged on the board, with the help of coloured lines showing the eventual connections between pins that are required by the schematic, to aid in finding a placement that will allow the most efficient track layout. It also provides a good autorouter, which, once the components have been placed, will attempt to automatically find an optimal track layout to make the electrical connections. The .brd files that EAGLE uses to store board layouts are accepted by many PCB production houses. Cadsoft EAGLE homepage Cadsoft EAGLE tutorials