Hello I just examined both of those sites http://xspace.sourceforge.net/=20 (tried it, but didn't work at first try) and=20 http://bugbear.blackfish.org.uk/~bruno/draft/ (also didn't work at first try) (will keep trying ;)) and I'm excited by this new revolutionary idea! Indeed the most important thing we have to develop is a very precise and al= so very open to extending (but still following the specification) data form= at. With this data format everyone on the world can easily add his three cents = to make a better/easier CAD editor for this. Someone is good at spline math= ? Great, he will only write a program that allows drawing splines. someone = is good at 3d bool operations? great! - he can now write only this. without= interfering with the rest of the data. And other thing is a viewer application. That understands and displays the = file format. Perhaps lx-viewer could be usad as a starting point? ah, well. the only thing I personally miss the most is my autocad style of = drawing... with command line, just some command <space> <space> <click> <cl= ick> <space> m <space> <click> (another two-letter command)... that's very = fast method to work. And yet there are no opensourde cad applications that = allow that. Perhaps one based on this file format will be made? As a intermediate linux C++ programmer I'm eager to help. janek kozicki