Here are some places where you can look for information about REX:

Homepage
REX has a homepage that can be found at http://www.neuroimaging.org.au/nig/rex
Forums
  1. open-discussion: General Discussion
  2. help: Get Public Help
Trackers
  1. Bugs: Bug Tracking System
  2. Support: Tech Support Tracking System
  3. Patches: Patch Tracking System
  4. Feature Requests: Feature Request Tracking System