Unlike GearView, this viewer worked for me under Windows 8. The software is developed in Objective-C on a Macintosh platform under the MacOS X operating system using the GNUstep development environment. References Lines and autohoming for comparing series. Multi-images view with series sychronization. Exports to QuickTime, JPEG, JPEG2000, TIFF, BMP.
Uncompressed, JPEG, and RLE color and grayscale DICOM images supported. iRad is a DICOM viewer exclusively written for MacOSX.It can also read many other file formats: TIFF (8,16, 32 bits), JPEG, PDF, AVI, MPEG and QuickTime. OsiriX is complementary to existing viewers, in particular to nuclear medicine viewers.
It is actually the free version of an expensive DICOM viewer. Horos is an open source DICOM viewer for Mac. PostDICOM is one of the best DICOM viewers that offers almost all of the above features.