The input.zip file contains plumed input files to run Metadynamics and MetaITS using the TIP4P/Ice model. The Nucleation.zip file contains the raw trajectories of three ice nucleation events at homogeneous condition using the TIP4P/Ice model. One has 1600 water molecules in the system while the other two have 2880 water molecules. The CriticalNucleus.zip file contains the raw trajectories, in which one trajectory shows the ice critical nucleus melts while the other one shows the ice critical nucleus grows.