I'm always looking for DICOM tools to use in practice and for training purposes. After some searching on the web I've located some links to free DICOM tools that could be usefull. I did not test them all so I'm not sure of the quality of the tools, but here they are (if you notice broken links or tools that are not free (anymore) please let me know).
Orthanc aims at providing a simple, yet powerful standalone DICOM server. Orthanc can turn any computer running Windows or Linux into a DICOM store (in other words, a mini-PACS system). Its architecture is lightweight, meaning that no complex database administration is required, nor the installation of third-party dependencies.