CAD Builder is a freeware parametric CAD modeler.
CAD Builder is designed for both professionals (engineers, architects, constructors, etc.), who has got used to work with parametric CAD software, and users with no or little CAD experience. It allows creating 3D models, modifying them and reusing in other applications. Created models are fully parametrical. So, a user can change initial objects, entered parameters, insert intermediate operations and get the final model modified accordingly. CAD Builder supports Python language to input model expressions or make scripts for automatization.