Programming language: FORTRAN 77 (there should be some evolution in the next major release).
Binaries/executables are not distributed; the program has to be compiled and linked, eg with GNU's gfortran.
Please report any error you may happen to find.
Latest version: qgraf-3.3 (July 2018).
The features added since the release of version 3.1.4 include:
increased performance in some ‘extreme’ cases (3.1.5);
option “onshellx”, an extended form of “onshell” (3.2);
a way of restricting the configuration of external lines (3.3);
the ability to require/disallow bridge-type propagators with certain momenta (3.3);
improved treatment of duplicate vertices (3.3).
A note to software developers:
qgraf-3.4, which should be available by the end of 2018, will be the next ‘stable’ version
(ie available for a long period, minimal fixes if need be).
The diagram generation is based on the algorithm described in the following article:
Automatic Feynman graph generation
J. Comput. Phys. 105 (1993) 279-289