MD
Autodock: Automated docking tools.
MDAnalysis: Python library to analyze trajectories from molecular dynamics simulations.
VMD: Molecular modelling, visualization, and analysis program.
Chimera: Visualization and analysis of molecular structures and related data.
Gromacs: MD package mainly designed for simulations of proteins, lipids, and nucleic acids.
QM
ORCA: provides cutting-edge methods in the field of electronic structure theory, including DFT and correlated wave function-based methods.
Avogadro: Advanced molecule editor and visualizer designed for cross-platform use in molecular modeling, bioinformatics, materials science, and related areas.
VESTA: 3D visualization program for structural models, volumetric data such as electron/nuclear densities, and crystal morphologies.