ABINIT is a package whose main program allows one to find the total energy, charge density and electronic structure of systems made of electrons and nuclei (molecules and periodic solids) within Density Functional Theory (DFT), using pseudopotentials and a planewave or wavelet basis.
ACES (Advanced Concept in Electronic Structure) is a quantum chemistry software package that implements coupled cluster methods for parallel computers.
CFOUR (Coupled-Cluster techniques for Computational Chemistry) is a program package for performing high-level quantum chemical calculations on atoms and molecules.
The General Atomic and Molecular Electronic Structure System (GAMESS) is a general ab initio quantum chemistry package.
Gaussian is a popular quantum chemistry software package.
Gaussview is a graphic interface for the Gaussian software.
Rapid ab initio electronic structure package.
There are NBO functions that come with the Gaussian program. However, there is also an add on package to Gaussian that installs extended NBO functionality. Both are available at the Alabama Supercomputer Center.