The XNAT user documentation describes common tasks for PIs, study coordinators, image uploaders, and users in general.
How to install, configure, maintain, and extend XNAT.
All the details you need for hosting, deploying, securing and maintaining your XNAT instance at whatever scale you need.
Everything you need to develop new functionality for your XNAT
Sometimes a dedicated tool is the best fit for a particular job. Here are the ones custom-built for XNAT.