OBJ_IO is a MATLAB library which reads or writes some of the 3D graphics information stored in an Alias OBJ file.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
OBJ_IO is available in a C++ version and a FORTRAN90 version and a MATLAB version.
IVCON, a C++ program which can convert graphics information between STLA and other formats.
IVREAD, a FORTRAN90 program which can convert graphics information between STLA and other formats.
OBJ, a data directory which has some examples of OBJ files.
OBJ_TO_PLY, a C program which reads an OBJ file and writes similar information to a PLY file.
OBJ2OPENGL, a PERL script which converts an OBJ file to a C/C++ include file appropriate for use with OpenGL.
PLY_TO_OBJ, a C program which reads a PLY 3D graphics file and writes an equivalent OBJ graphics file.
You can go up one level to the MATLAB source codes.