Here at Heeks Software, you can buy HeeksCNC 1.4, a CAD/CAM application for Windows, for only £10, that can help you produce the NC code for your milling machine. Many happy customers are already using HeeksCNC to boost their productivity.

HeeksCNC is totally open source ( see here for source code details ) . You can modify it to suit your company's needs. The NC code can be configured by editing files written in the popular "Python", a clear and powerful programming language.