A new Test Driver for computing monovacancies in arbitrary crystals is now available in OpenKIM (DOI: 10.25950/cea3ae2e). It computes the relaxed and unrelaxed formation energies and relaxation volumes for each symmetrically distinct site in any crystal, as well as relaxed and unrelaxed effective formation energies for a composition-preserving distribution of vacancies. It was developed by Eric Fuemmeler based on previous work by Junhao Li. As part of the Crystal Genome (XtalG) framework, results will become available on the material pages accessible through the "Search for Predictions" interface on openkim.org as they are computed. As with all XtalG Test Drivers, it is also available as a standalone Python class, in this case VacancyFormationEnergyRelaxationVolumeCrystal, as part of the kimvv Python package. This enables users to obtain these material properties for any crystal using their own interatomic model. Supported models include all KIM API compliant models, including any LAMMPS pair_style through the Simulator Model mechanism, as well as any ASE Calculator, including quantum-mechanical calculators.