OpenMesh is a C++ library for mesh manipluation. OpenMeshD is a port of that library to the D Programming Language.

From the original C++ OpenMesh introduction page:

OpenMesh is a generic and efficient data structure for representing and manipulating polygonal meshes. OpenMesh is developed at the Computer Graphics Group, RWTH Aachen, as part of the OpenSGPlus project, is funded by the German Ministry for Research and Education (BMBF), and will serve as geometry kernel upon which the so-called high level primitives (e.g. subdivision surfaces or progressive meshes) of !OpenSGPlus are built. It was designed with the following goals in mind :

• Flexibility : provide a basis for many different algorithms without the need for adaptation.
• Efficiency : maximize time efficiency while keeping memory usage as low as possible.
• Ease of use : wrap complex internal structure in an easy-to-use interface.