PMDesk 2017 SP2 now has PRINCE2 tolerance features!
From PMDesk 2017 SP2 you can easilly set up tasks and project tolerance, which is PRINCE2 project management function/attribute. It’s great feature for projects which has bigger risk or schedule is related to many sub-contractors or events, which are behind our influence.
You can set up tolerance based on whole project and every particular task. In addition, on portfolio management screen (where you can see all projects), you can track graphically project execution vs tolerances.