Charge Distribution in EM software

Hi, I am wondering are there any EM software can be used to display charge density (time Harmonic or transient)? Thanks

In Sonnet, check Analysis->Setup->Compute Current Density. Then, after analyzing the layout, select Project->View Current. Then, select View->Parameters->Charge. You can even do this in free SonnetLite (www.sonnnetsoftware.com, I work for Sonnet).