Echoing what @Entropy512 said Lumariver is a fancy GUI for Dcamprof…if you follow the Rawpedia link given by @Jade_NL the basic command lines are there to create your DCP. Having said that your comments were a bit confusing as you mentioned on one hand writing your own DCP software but were confused by Coca…a very simple GUI for Argyllcms. In Coca you simply pick the layout of your card and the matching data file and then point it to the tif image of your card and then its just a matter of picking the style of icc you want and you can tweak the white patch brightness and the gamma with a couple of settings…I think that is it… So if you found that interface too confusing then the Lumariver one is armed with a barrage of options…making it powerful but with so many choices you might again not find what you want in your workflow…on the other hand maybe it is what you are looking for??