Plumber

http://www.ima.ge.cnr.it/ima/smg/plumber-web/plumber-web.html

The Plumber algorithm is finalized at the identification of tubular features of 3D objects represented by triangular meshes. Plumber is developed on the basis of the multiscale morphological characterization produced by "Tailor". For each tubular part found at a given scale, its approximated axis and cross sections are determined. The final goal is to segment a 3D model into main bodies and tubular parts and to encode the tube/body connectivity and the spatial arrangement of the tube attachments onto the body.

ReMESH

http://www.ima.ge.cnr.it/ima/personal/attene/PersonalPage/Remesh/ReMesh.html

ReMesh is an editor for manifold triangle meshes. Most operations can be performed interactively through mouse-clicks on the mesh. Both low-level (edge-flip, vertex-insert, ...) and high-level (simplification, subdivision, ...) operations are supported.

SHREC

http://www.ima.ge.cnr.it/ima/smg/shrec-web/SHREC.htm

SHREC is a tool for characterizing (in the sense of computing maxima, minima and saddles) a surface with or without boundary with respect to a real function by computing a set of contour levels. Starting from such a characterization, SHREC is also able to compute a Reeb graph of the surface.