MRIcroGL is an open source volume ray caster. For details and compiled versions visit the NITRC wiki. You can also visit the MRIcroGL home pages which include videos, notes on compiling and troubleshooting advice.
http://www.mccauslandcenter.sc.edu/mricrogl/
9-September-2015
- Add retina and 64-bit support for OSX. Better compatibility with VirtualBox. New shaders. Retina quality screen captures.
This software includes a BSD license