ModelMuse supports two post processors: MODPATH and ZONEBUDGET. They can be selected on the can be selected in the MODFLOW Packages and Programs dialog box.
MODPATH is used for particle tracking. The user assigns starting locations for particles and MODPATH will track the advective transport of those particles either forward or backwards.
ZONEBUDGET is used for constructing subregional water budgets. The user assigns cells to zones and ZONEBUDGET constructs a water budget for all the cells in each zone.