Software

Amenta's Directory of Computational Geometry Software - Lot of categories and links.
www.geom.uiuc.edu/software/cglist/

CGAL - Computational Geometry Algorithms Library - A collaborative effort to develop a robust, easy to use, and efficient C++ software library of geometric data structures and algorithms.
www.cgal.org/

CM2 Mesh Tools - Professional C++ mesh generators. Includes product information and news releases.
www.computing-objects.com/en/meshtools.html

Computational Geometry Code - Jeff Erickson's links to freely available implementations of geometric algorithms and software.
compgeom.cs.uiuc.edu/~jeffe/compgeom/code.html

Delaunay Triangulation Code - J-D. Boissonnat et al.'s code for Delaunay meshing in 2 and 3 dimensions in C++.
www-sop.inria.fr/prisme/logiciel/del-tree.html

Edgebreaker 3D Compression for Triangle Meshes - Source code, explanations, file formats, and examples of the Edgebreaker compression and decompression techniques.
www.gvu.gatech.edu/~jarek/edgebreaker/eb/

Fast Industrial-Strength Triangulation - By Martin Held. Copes with polygons with holes and degeneracies/self-intersections; based on repeatedly clipping ears. Source code on request.
www.cosy.sbg.ac.at/~held/projects/triang/triang.html

Fast Robust Predicates for Computational Geometry - C code for orientation and incircle tests using adaptive-precision floating-point arithmetic
www.cs.cmu.edu/~quake/robust.html

FastGEO Computational Geometry Library - FastGEO, A computational geometry library written in the object pascal language.
www.partow.net/projects/fastgeo/index.html

Gmsh - Gmsh is a three-dimensional finite element mesh generator, primarily Delaunay, with built-in pre- and post-processing facilities. Gmsh is freely available for Windows and most UNIX platforms.
www.geuz.org/gmsh/

GTS - The GNU Triangulated Surface Library - Open-source library for manipulating 3D triangular surface meshes. Delaunay triangulations, robust geometric predicates, robust boolean set operations on surfaces, surface refinement and coarsening, level-of-detail, k-d trees, volume and curvature, strips generation.
gts.sourceforge.net/

JeoEdit - Two Java applets for editing polygons and point sets for input to computational geometry software.
cgm.cs.mcgill.ca/~godfried/jeoedit/

Knotenpunkt - Produces commercial software that creates a surface model out of a pointcloud or polymesh [Balingen, Germany].
www.knotenpunkt.com/home_E.htm

Polyhedral FAQ - Frequently Asked Questions in Polyhedral Computation.
www.ifor.math.ethz.ch/~fukuda/polyfaq/polyfaq.html

Polymake - A tool for the algorithmic treatment of polytopes and polyhedra.
www.math.tu-berlin.de/polymake/

Qhull - Computes convex hulls, Delaunay triangulations, Voronoi diagrams, half-space intersections about a point, furthest-site Delaunay triangulations, and furthest-site Voronoi diagrams. It runs in 2-d, 3-d, 4-d, and higher dimensions.
www.qhull.org/

QMG project - Mesh generation in 2D and 3D on Unix and NT, and related software by Steven Vavasis.
www.cs.cornell.edu/Info/People/vavasis/qmg-home.html

Smallest Enclosing Ball of Points - Fast and robust C++ code available under GNU license. Handles arbitrary dimensions, and has high numerical stability.
www.inf.ethz.ch/personal/gaertner/miniball.html

Stony Brook Algorithm Repository - Section on Computational Geometry - Summary of major CG problems and implementations of their solutions
www.cs.sunysb.edu/~algorith/major_section/1.6.shtml

Surface Evolver - Free interactive program for modelling liquid surfaces shaped by various forces and constraints, e.g., minimal surfaces (bubbles). Applies gradient descent to minimize energy. Available for most platforms.
www.susqu.edu/facstaff/b/brakke/evolver/

Surface Reconstruction Algorithms Page - Links to Surface Reconstruction software, papers, people.
www.compgeom.com/www.sites.html

Triangle - Jonathan Richard Shewchuk's Two-Dimensional Quality Mesh Generator and Delaunay Triangulator.
www.cs.cmu.edu/~quake/triangle.html