A new version of MCalibration and PolyUMod was just released (v.2.5.7). The new version contains a large number of interesting and useful new features, for example:
MCalibration: Improved the experimental data cleanup features.
MCalibration: Improved stability of the software.
PolyUMod: Added a new material model called the Multi-Temperature model. The Multi-Temperature model framework is not a single material model but a framework for making any other PolyUMod material model temperature dependent.
Check out the following page
for more info, you can also read the detailed change log here