Origami Editor 3D is an advanced paper folding simulator. It uses a what-you-see-is-what-you-get interface and operates with a geometric abstraction of the Yoshizawa-Randlett system. Anything from a simple airplane to John Montroll's omega star can be folded in this editor.
Origami files created with the program preserve the entire folding process, and they can be exported as folding diagrams in PDF, animated GIF files, or even as standalone Java programs displaying the origami in a 3D...
...You can create complex geometric constructions in spherical geometry with this software. It supports orthogonal, stereographic and gnomonic projections to display your construction. It also has a built in scripting language for automated constructions.
domes, vaults and eggs - program to create 3D models and plans
...The first is OBJ file you can import to 3D modelling software, such as Autocad or Blender. The second output is CSV file you can open in OOCalc or Excel and use as plans for actual construction. The application is written in Tcl and released under WTFPL.
XISL (XML based scripting of Implicit Surfaces) package (written in C++) assists developers in construction of arbitrary implicit models. Each implicit function class (a primitive, an operation, etc.) is deffined by its appropriate XISL tag(s).
PRPbyHand (Paper Rapid Prototyping by Hand) produces a bitmap image from a slice take from STL (stereolitography) ASCII file, in the z axis. It's intended for construction of 3D modell by hands, gluing common A4 paper sheets.
Library intended for construction, evaluation, manipulation and visualization of geometric objects, especially for parametric and implicit defined surfaces
FMC will provide a Model-View-Controller architecture for
developers to make Freality: an extensible metaverse, for
gaming, socializing, exploration and pretty much everything
under the virtual sun.