Download statistics for the 3D Slicer extensions developed with the contribution of the Quantitative Imaging Informatics for Cancer Research (QIICR) project. Note that extensions were released at different times, with some extensions being available longer than others. Some of the extensions are dependent on others (eg, PETDICOMExtension can be installed individually, but is also downloaded every time PET-IndiC or QuantitativeReporting is installed). Statistics reported were collected on December 15, 2019, using the script available publicly at https://github.com/Slicer/SlicerDeveloperToolsForExtensions. These reported download counts do not include downloads of the binary packages directly from GitHub or downloads of Docker images from DockerHub (which were used for disseminating dcmqi packages), or downloads of the source code (due to technical limitations of being able to track such downloads).