Versatile Object-oriented Toolkit for Coarse-graining Applications (VOTCA) is a Coarse-grained modeling package, which focuses on the analysis of molecular dynamics data, the development of systematic coarse-graining techniques as well as methods used for simulating microscopic charge (and exciton) transport in disordered semiconductors. It was originally developed at the Max Planck Institute for Polymer Research, and is now maintained by developers at the Max Planck Institute for Polymer Research, Los Alamos National Laboratory, Eindhoven University of Technology and the Beckman Institute for Advanced Science and Technology with contributions from researcher worldwide.