A CAD prog with API that could be made into Flows-capable?

Besides the standard object types such as annotations, meshes and parts objects, FreeCAD also offers the amazing possibility to build 100% python-scripted objects, called Python Features. Those objects will behave exactly as any other FreeCAD object, can be saved in a document and opened on any other installation of FreeCAD, since the python code that defines the object is also saved in the document.

Open source brick building CAD

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

+ From: "Architexturez."
+ Date: Sat, 10 Jun 2006 18:45:38 +0530

Impact - a Free Explicit Dynamic Finite Element ProgramCrushed profile

Impact is an open source finite element program suite which can be used to predict most dynamic events such as car crashes or metal sheet punch operations. They usually involve large deformations and high velocities.

Simulations are made on a virtual three dimensional model which can be created with a pre-processor or with the built-in Fembic language. Results are viewed in a post-processor.