Download of ViewNX-i 1.4.5 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is Nikon Inc. We recommend checking the downloaded files with any free antivirus. The application belongs to Design & Photo Tools.
From the developer:
ViewNX-i is a free app that allows you to view images and video files. With this app you can browse still image and video files, edit still images via Capture NX-D or video files via ViewNX-Movie Editor. The software is compatible with all current and previous Nikon digital cameras including DSLR, Nikon 1 and COOLPIX cameras.
You may want to check out more software for Mac, such as Morph Age, Norrkross MorphX or Photo Mechanic, which might be related to ViewNX-i.