APE (Atomic Pseudopotential Engine) is a tool for generating atomic pseudopotentials within a Density-Functional Theory framework. It is distributed under the GPL and it produces pseudopotential files suitable for use with Siesta, Octopus, pwSCF, Abinit
Octopus is a scientific program aimed at the ab initio virtual experimentation on a hopefully ever-increasing range of system types. Electrons are described quantum-mechanically within density-functional theory (DFT), in its time-dependent form (TDDFT) when doing simulations in time. Nuclei are described classically as point particles. Electron-nucleus interaction is described within the pseudopotential approximation. Octopus is free software, released under the GPL license.