This set of tools has been developed to interact with XNAT servers. Some were developed by the XNAT Team in the Neuroinformatics Research Group (NRG) at Washington University. Others were developed by XNAT users and developers around the world.
There are more tools and XNAT Extensions available at the XNAT Marketplace (http://marketplace.xnat.org).
Are you interested in developing an XNAT Tool? Here are some resources to help you get started.