Open-source toolkit for radiation therapy research, an extension of 3D Slicer. Features include DICOM-RT import/export, dose volume histogram, dose accumulation, external beam planning (TPS), structure comparison and morphology, isodose line/surface generation, etc.
See https://discourse.slicer.org/t/who-owns-the-slicer-username-or-group-on-gitlab-com/15530/4