Ergo is a quantum chemistry program for large-scale self-consistent
field calculations.

Key features of the Ergo program:
* Performs electronic structure calculations using Hartree-Fock and
  Kohn-Sham density functional theory.
* Written in C++.
* Uses Gaussian basis sets.
* Both core and valence electrons are included in the calculations.
* Both restricted and unrestricted models are implemented for energy
  calculations.
* Implements a broad range of both pure and hybrid Kohn-Sham density
  functionals.
* Employs modern linear scaling techniques like fast multipole
  methods, hierarchic sparse matrix algebra, density matrix
  purification, and efficient integral screening.
* Linear scaling is achieved not only in terms of CPU usage but also
  memory utilization.
* The time consuming parts of the code are currently parallelized
  using the shared-memory paradigm.

WWW: http://www.ergoscf.org/