Well, we're giving final touches to the 3D MPR before a public release. It's getting closer and closer :-)
RadiAnt DICOM Viewer 3.9.36 Beta
built on March 23, 2017
New features:
Save to JPEG and copy images in the 3D MPR window.
Improvements and bug fixes:
Enhanced settings for axes auto centering (always, only hidden, never).
http://www.radiantviewer.com/beta