darktable is an open source photography workflow application
Display, convert, and edit raster image and vector image files
Drawing, graphics conversion, software development, administration.
Open Source Solid Modeling CAD
Library to correct optical lens defects and lens database
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Free drawing software for Windows, Mac OS X, and Linux
Software for data analysis, image processing, simulations, solver.
Not your usual Architectural Modeler