Solving two electron integral numerically

Is there any software package in python or C to evaluate two electron integral repulsion integral in quantum chemistry of atoms. I am trying to solve the helium atom by constructing many body basis.Using those basis i am attempting to evaluate matrix elements.Also please suggest some references to understand more about two electron integral.

• There are github.com/evaleev/libint and github.com/sunqm/libcint for calculating integrals over GTOs, if that is what you mean. For standard literature take a look at the books by Szabo and Ostlund as well as Helgaker, Jorgensen and Olsen, both about electronic structure theory. – Feodoran Oct 24 '18 at 13:34