VINCI (Volume Imaging in Neurological Research, Co-Registration and ROIs included) was designed for the visualization and analysis of volume data, particularly neurological PET scans (but is also used routinely for animal studies). It supports DICOM and multiple file formats, particularly those common in nuclear medicine applications: ECAT and Interfile. VINCI supports multiple orthogonal displays, VOI and ROI features, modifiable color maps, and several reslicing/resampling modes. Co-registration is provided in automatic and semi-automatic modes. The program is based on an extensible plugin framework and may be scripted in Python, Matlab and Julia and remotely controlled through an API. The free version is a slightly limited edition of the full version which is free for non-commercial, academic use after registration.