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GraphicsMagick provides a set of commandline tools and programming APIs for manipulating, editing, and converting raster and vector images. It is derived from ImageMagick, with the objective of providing better stability and performance than ImageMagick while retaining the original MIT/X11 license.
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
surfit is an open source and free gridding and contouring software. surfit can do interpolation/approximation of points, contours and surfaces, can take fault lines and trend surfaces into account, can use inequalities and other conditions. Supports a lo
domes, vaults and eggs - program to create 3D models and plans
Commandline application that enables you to create wide range of domes, vaults, tubes or egg-like shapes from triangular desks. The arch is always in the shape of catenary that makes it possible to design and build extremely tough models or buildings suitable for underground/underwater architecture. The program has two outputs. The first is OBJ file you can import to 3D modelling software, such as Autocad or Blender.
Lamia or Lamia Engine is the modern generation free distributable and open source game engine for creating computer games for several prevailing software platforms and very maybe hardware platforms either.
TyGeMo is a Tcl/Tk based front-end to the digital camera software, photopc (http://photopc.sourceforge.net). Its goal is to provide all the funtionality of the commandline based photopc in a user friendly GUI application.