  We present the formalism and implementation of quasi-particle self-consistent
GW (qsGW) and eigenvalue only quasi-particle self-consistent GW (evGW) adapted
to standard quantum chemistry packages. Our implementation is benchmarked
against high-level quantum chemistry computations (coupled-cluster theory) and
experimental results using a representative set of molecules. Furthermore, we
compare the qsGW approach for five molecules relevant for organic photovoltaics
to self-consistent GW results (scGW) and analyze the effects of the
self-consistency on the ground state density by comparing calculated dipole
moments to their experimental values. We show that qsGW makes a significant
improvement over conventional G0W0 and that partially self-consistent flavors
(in particular evGW) can be excellent alternatives.
