I'm not Robin, but Turbocnc is my controller of choice. I have been using it since about 2000. I used it for quite a while before I registered it. It is fully functional when you download it. Registration gives you access to the source code so you can make your own changes. It is written in pascal and compilers are available as freeware. Doesn't have a lot of bells and whistles, but it gets the job done and as far as I am concerned, it does it quite well.