Amenta's Directory of Computational Geometry Software
   Lot of categories and links.
   http://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.
   http://www.cgal.org/

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

Computational Geometry Code
   Jeff Erickson's links to freely available implementations of geometric algorithms and software.
   http://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++.
   http://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.
   http://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.
   http://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
   http://www.cs.cmu.edu/~quake/robust.html

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

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, strip
   http://gts.sourceforge.net/

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.
   http://www.geuz.org/gmsh/

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

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

Knotplot
   A program for exploring topological knots and knot-like objects in a 3-D rendered environment offering stills, animated knots (including dynamic forces) and demos. Aimed at mathematician and artist alike.
   http://www.cs.ubc.ca/nest/imager/contributions/scharein/KnotPlot.html

Mg R-tree Library
   A simple C++ R-tree implementation with Segment Incidences Detector as an application.
   http://www.volny.cz/r-tree/

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

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

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

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.
   http://www.qhull.org/

Smallest Enclosing Ball of Points
   Fast and robust C++ code available under GNU license. Handles arbitrary dimensions, and has high numerical stability.
   http://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
   http://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.
   http://www.susqu.edu/facstaff/b/brakke/evolver/

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

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