DipTrace : http://www.diptrace.com/
CopperCAM : http://www.galaad.net/coppercam-eng.html
Mach3 : http://www.machsupport.com/
I used DipTrace form y PCB Layouts but any software cable of saving Gerber files can be used. Its Free if you can be under 300 pins. Witch works fine for most of my projects.
To control my CNC Mill I use Mach 3, but any other software can be used such as LinuxCNC and EMC2.
But for me I think the 175$ for a Mach 3 License is well spend since it’s a great peace of software.
I also got an license for CopperCAM for 80 € which is good given out and don’t have to mangle with a lot of conversation programs and scripts. Her I gave a great GUI and can see what’s happens and change the settings easily.
I will make the Tutorial both as a Video and Images Step by Step Guide
The Video can be seen her, the Image and Text Step by Steps on the next pages.