Gmsh is an automatic three-dimensional finite element mesh generator, primarily Delaunay, \with built-\in pre- and post-processing facilities. Its primal goal is to provide a simple meshing tool \for academic test cases \with parametric input and up to date visualization capabilities. One of the strengths of Gmsh is its ability to respect a characteristic length field \for the generation of adapted meshes on lines, surfaces and volumes.These adapted meshes can be mixed \with simple structured (transfinite, elliptic, etc.) meshes \in order to augment the flexibility. Gmsh is structured around four modules: geometry, mesh, solver and post-processing. The specification of any input to these modules is done either interactively, or \in text data files (interactive specifications generate language bits \in the input file, and vice versa). The accessibility of most features \in the ASCII text file makes it possible to automate all treatments (loops, tests and external access methods permit advanced scripting capabilities).
I'm developping GMSH together with Christophe Geuzaine, currently post doctoral researcher at the Applied and Computational Math. Dept. of Caltech . The official web page of GMSH can be found here. Executable versions of GMSH can be found there for most UNIX and Windows plateforms. For the source code, we will release it soon. If you are in a hurry, send us an email, we certainly can arrange something ;-)