SketchFlat, an interesting "CAD" type of program

[PeterCharles]

I was googling for a 2D CAD program with "constraints" and came across SketchFlat.
http://www.cq.cx/sketchflat.pl

I'm just playing with it, but I have some ideas how it can help me lay out simple 2D pieces of handling equipment while maintaining critical constraints between them. I can then save the simple outlines as DXF files and load them into other software to make pretty drawings.