There is lots of software in the market for PCB. But I am giving you a list of top used PCB Software’s and PCB industry sites list.
1.   http://www.zenitpcb.com/
2.   http://www.freepcb.com/
3.   http://www.osmondpcb.com/
4.   http://www.electroschematics.com/832/expresspcb-download/
5.   http://www.a-flex.com/printed-circuit-board-manufacturing.html
6.   http://www.kicad-pcb.org/display/KICAD/KiCad+EDA+Software+Suite
7.   http://www.gpleda.org/
8.   http://fritzing.org/home/
9.   http://www.rs-online.com/designspark/electronics/eng/page/designspark-pcb-home-page

I think they will help you in building a good list of PCB softwares.
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