Fritzing – An open-source hardware initiative

Fritzing is an open-source hardware initiative that makes electronics accessible as a creative material for anyone. We offer a software tool, a community website and services in the spirit ofProcessing and Arduino, fostering a creative ecosystem that allows users to document their prototypes, share them with others, teachelectronics in a classroom, and layout andmanufacture professional pcbs.

http://fritzing.org/home/

Another good alternative:

• https://circuits.io/