(commercial) a 2D-CAD program for technical and architectural drawings. Offers 6 line types, 32000 groups and 1024 layers
CamSketchpad is a modern recreation of Ivan Sutherland's seminal Sketchpad program. It's a 2D drawing and CAD program with support for geometrical constraints and the inclusion of instances referencing other drawings. It includes a very flexible geometric constraint satisfaction system based on error minimization and basic support for algebraic constraint satisfaction.