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tmLQCD is a freely available software suite providing a set of tools to be used in lattice QCD simulations. This is mainly a HMC (including PHMC and RHMC) implementation for Wilson, Wilson Clover and Wilson twisted mass fermions and inverter for different versions of the Dirac operator. The code is fully parallelised and ships with optimisations…
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README

The following numbers might be taken as reference points:

4^4 lattice, beta 6.0, kappa=0.177, 2*kappa*mu=0.177 (this is the input
value), antiperiodic boundary conditions:

Plaquette: 0.62457(7)

4^4 lattice, beta 4.0, kappa=0.1, 2*kappa*mu=0.26795, antiperiodic
boundary conditions:

Plaquette: 0.29164(2)

4^4 lattice, beta 4.0, kappa=0.05, 2*kappa*mu=0.26795, antiperiodic
boundary conditions:

Plaquette: 0.29055(3)

You can also have a look to the following numbers:

mu = 0.1 -> 2kappa mu = 0.0354
beta = 5.1
kappa = 0.177
4^4 Lattice

          <P>                tau_int    #       dtau
antiperiodisch
------------------------------------------------------
Carsten   0.5351(4)          3.16       4800    0.05
          0.5345(4)          2.99       4800    0.05
          0.5351(5)          4.10       4800    0.0667
          0.5350(4)          3.97       4800    0.1
          0.5348(5)          4.33       4800    0.1667
------------------------------------------------------

periodisch
------------------------------------------------------
Carsten   0.5339(5)          4.49       4850    0.05
          0.5341(4)          4.08       4800    0.1667
          0.5338(4)          3.02       4800    0.1667
          0.5333(5)          4.18       4800    0.1667
------------------------------------------------------

kappa = 0.177 mu = 0
antiperiodisch
------------------------------------------------------
Carsten   0.5363(4)          3.50       4800    0.1667
          0.5363(4)                     4800    0.1667
------------------------------------------------------

periodisch
------------------------------------------------------
Carsten   0.5356(4)          3.19       4800    0.1667
------------------------------------------------------

mu = 0.05
antiperiodisch
------------------------------------------------------
Carsten   0.5355(4)                     4800    0.1667
------------------------------------------------------

kappa = 0.177, mu = 0.3 (here I see a phase transition)
antiperiodisch
------------------------------------------------------
Carsten   0.513(3)           44         4800    0.1667
------------------------------------------------------

kappa = 0.177, mu = 0.5
antiperiodisch
------------------------------------------------------
Carsten   0.4678(9)          9.09       4800    0.1667
------------------------------------------------------

kappa =0, mu = 0.5
antiperiodisch
------------------------------------------------------
Karl      0.4155(6)          2.31       1200    0.166
------------------------------------------------------
Carsten   0.4150(4)          3.08       4800    0.1667
          0.4151(4)          3.20       4800    0.1667
------------------------------------------------------

beta =6.0, kappa=0.177, mu=0.5, 2 kappa mu = 0.177
antiperiodisch
------------------------------------------------------
Karl      0.6243(3)          1.87       2200    0.166
------------------------------------------------------
Ines      0.6244(2)                     3600
------------------------------------------------------
Carsten   0.6246(2)          1.88       4800    0.1667
------------------------------------------------------

beta =6.0, kappa=0.177, mu=0.1, 2 kappa mu = 0.0354
antiperiodisch
------------------------------------------------------
Karl
------------------------------------------------------
Carsten   0.6310(2)          2.2        4000    0.1667
------------------------------------------------------

beta =6.0, kappa=0.177, mu=0.01, 2 kappa mu = 0.00354
antiperiodisch
------------------------------------------------------
Karl
------------------------------------------------------
Carsten   0.6308(2)          2.3        4000    0.1667
          0.6313(2)          2.2        4000    0.1667
------------------------------------------------------

beta = 6.0, kappa = 0.177, 2 kappa mu = 0.5
------------------------------------------------------
Carsten   0.6095(3)          2.8        4000    0.1667
------------------------------------------------------
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