In the following, we will first introduce the new implementations of equivariant features in PiNet2 and special-purpose modules PiNet2dipole and PiNet2-χ. This is followed by the introduction of plug-ins PiNNAcLe and PiN-Nwall. Then, comparisons of performance between PiNet and PiNet2 on different public datasets including small molecules, crystalline materials and liquids will be presented. Finally, the applications of PiNN to two realistic electrochemical systems are demonstrated.