Lattice QFT with FermiQCD
  FermiQCD is a C++ library for fast development of parallel Lattice Quantum Field Theory computations. It has been developed following a top-down fully Object Oriented design approach with focus on simplicity of use. FermiQCD includes: a heatbath algorithm for Wilson and $O(a^2)$ improved SU(n) gauge actions; inversion algorithms for Wilson, Clover, Kogut-Susskind, Asqtad, and Domain Wall fermionic actions; example programs for various types of meson propagators; and converters for the most common gauge file formats. 
Massimo Di Pierro and Jonthan M. Flynn