Kicad is an open source (GPL) software for the creation of electronic schematic diagrams and printed circuit board artwork.

Designed and written by Jean-Pierre Charras, a researcher at LIS (Laboratoire des Images et des Signaux) and a teacher in IUT de Saint Martin d'Hères.(France), in the field of electrical engineering and image processing.
Kicad is a set of four softwares and a project manager:

Eeschema :Schematic entry.
Pcbnew :Board editor.
Gerbview :GERBER viewer (photoplotter documents).
Cvpcb :footprint selector for components used in the circuit design.
Kicad: project manager.

Via Gust MEES