The CancerData site is an effort of the Medical Informatics and Knowledge Engineering team (MIKE for short) of Maastro Clinic, Maastricht, The Netherlands. Our activities in the field of medical image analysis and data modelling are visible in a number of projects we are running. CancerData is offering several datasets. They are grouped in collections and can be public or private. You can search for public datasets in the NBIA (National Biomedical Imaging Archive) image archives without logging in.
The MIKE team encourages the use of Free and Open Source Software (FOSS). The CancerData site is build with a DRUPAL (https://www.drupal.org/) web portal, caBIG (http://cbiit.nci.nih.gov/ncip) data services and running on Debian (http://www.debian.org/ ) servers.