Psi4, open-source quantum chemistry
CheMPS2, S. Wouters' spin-adapted implementation of DMRG
DFTD3, S. Grimme's dispersion correction for DFT, HF, and semi-empirical
dkh, Wolf, Reiher, and Hess's Douglas-Kroll-Hess (DKH) relativistic correction
libefp, I. Kaliman's effective fragment potential (EFP) library
erd, N. Flocke and V. Lotrich's Gaussian molecular integrals for AcesIII
gCP, S. Grimme's geometrical counterpoise correction for DFT and HF
gdma, A. Stone's Gaussian distributed multipole analysis (GDMA)
Libint, E. Valeev and J. Fermann's two-body Gaussian molecular integrals
PCMSolver, R. Di Remigio's API for the polarizable continuum model
simint, B. Pritchard's vectorized Obara-Saika electron repulsion integrals
v2rdm_casscf, E. DePrince's variational 2-RDM-driven CASSCF plugin to Psi4
The 1.1 release (5/18/17) "inverts" the code so that it is now a Python module with a C++ core. It can be loaded into a Python script by import psi4 and called from Python with our new Python API (PsiAPI)