openfoam-dev: package of the development line of OpenFOAM, which includes major code changes that can break backward compatibility.
openfoam7: package created from the
OpenFOAM-7source repository that incorporates latest code fixes without breaking backward compatibility.
paraviewopenfoam56: package of ParaView for OpenFOAM, installed automatically as a recommended package of
To install OpenFOAM-dev on Ubuntu 20.04, see: Download OpenFOAM-dev | Ubuntu
To install OpenFOAM 7 on Ubuntu 20.04, see: Download v7 | Ubuntu