MILLENSYS DICOM Viewer (Free)
Free DICOM Viewer for daily usage

MILLENSYS Viewer "MiViewer" is a very easy to use general dicom viewer software to view multi-modality images and cine-loops using the same software. MiViewer can load images from dicom CD/DVD and from any other media e.g. HDD.
For more powerful viewing, visit Vision Tools MultiView workstation site