Much of the documentation for RT comes with RT itself. You can find setup instructions in the README file and see installation options by running the configure script. User documentation is under docs/. Technical documentation for each class in RT's source code is accessible using Perl's perldoc command. For example, to see the API documentation for the RT::Ticket class, run: perldoc lib/RT/Ticket.pm
This documentation is also available online:
The latest documentation is always at: https://bestpractical.com/docs/rt/latest/
Make sure to look at the documentation that corresponds with your version. You can find more details on RT versions, our release policy, and support on our release policy page. Release notes for all public releases are also available.
Additional information about RT and our related products is available on our community wiki. It contains helpful documentation like FAQs, troubleshooting tips, and customizations contributed by RT users like yourself.
If you're looking for more in-depth documentation, we wrote an entire book just about RT, which is available in a variety of formats.
RTIR uses RT to implement many core features, so the RT documentation above is a good resource. RTIR also had it's own:
Commercial Services and Support
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Community Help and Discussion
As of March 2017, we moved from a collective of mailing lists to a new forum. All list archives were imported so they should be searchable in the forum. Visit and let us know what you think!