using DARC in rosetta

 Hi all

  I'm using DARC(Docking approach using ray-casting) to do the blind ligand docking.

  In the tutorial of DARC, to include electrostatics calculations,  tools from openeye such as omerga were used.

  tools in openeye are not free.

  Are there similar tool or program to do electrostatics calculation in DARC  which is free?

 Thanks

Regards