Original sentence: ABINIT is a free software package for physicists, distributed under the GNU General Public License, whose main program allows the total energy, charge density, and electronic structure of systems made of electrons and nuclei (molecules and periodic/crystalline solids) to be calculated within Density Functional Theory (DFT), using pseudopotentials, and a plane wave basis.Amsterdam Density Functional.Excited states can be computed within the Time-Dependent Density Functional Theory (for molecules), or within Many-Body Perturbation Theory (the GW approximation).Octopus (software) - another free software quantum chemistry package.Quantum chemistry computer programs
Edited sentence: ABINIT is a free software package for physicists, distributed under the GNU General Public License, whose main program allows the total energy, charge density, and electronic structure of systems made of electrons and nuclei (molecules and periodic/crystalline solids) to be calculated within density functional theory (DFT), using pseudopotentials, and a plane wave basis.Excited states can be computed within the time-dependent density functional theory (for molecules), or within many-body perturbation theory (the GW approximation).List of quantum chemistry and solid state physics software