MGH
Users within the Martinos Center at the Massachusetts General Hospital can find executables and resources on the system cluster.
This is explained here (password required).
External Users
Users outside of the Martinos Center at the Massachusetts General Hospital can download executables, source code, and some resources from the Neuroimaging Informatics Tools and Resources Clearinghouse (NITRC):
http://www.nitrc.org/projects/jip/
Do to Copyright and other requirements, some resources cannot be distributed.