TRIANGLE_IO is a FORTRAN77 library which can read or write some simple versions of some of the files used by Jonathan Shewchuk's triangle() program.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
TRIANGLE_IO is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.
FEM_TO_TRIANGLE, a FORTRAN77 program which reads FEM files defining a 2D mesh of triangles, namely a file of node coordinates and a file of elements defined by node indices, and creates a corresponding pair of node and element files for use by Jonathan Shewchuk's triangle program.
POLY, a data directory which contains a description and examples of the POLY file format.
SHOWME, a C program which can display the POLY files uses as input to TRIANGLE, and the output files that define meshes and other objects.
TRIANGLE, a C program which computes Voronoi diagrams and Delaunay triangulations, and creates and manipulates files that can be displayed by SHOWME.
TRIANGLE_DISPLAY, a MATLAB program which displays the nodes and elements of a triangulation on the MATLAB graphics screen, assuming the data has been stored in NODE and ELE files by the TRIANGLE program.
TRIANGLE_FILES, a data directory of examples of files used by the triangle and showme programs.
TRIANGLE_TO_FEM, a FORTRAN77 program which reads the NODE and ELE files created by triangle() to describe a triangular mesh, and writes a corresponding pair of node and element files in the 2D FEM format.
TRIANGLE_TO_MEDIT, a FORTRAN77 program which reads the NODE and ELE files created by triangle() to describe a triangular mesh, and writes a corresponding MESH file for input to medit().
TRIANGLE_TO_XML, a FORTRAN77 program which reads the NODE and ELE files created by triangle() to describe a triangular mesh in 2D, and writes out a corresponding XML mesh file for use by DOLFIN or FENICS.
You can go up one level to the FORTRAN77 source codes.