Besides eXist-db's extensive documentation, eXist-db has a large and active community of users and developers. The community uses mailing lists, chat, a wiki, and social media—to get and give help, follow the latest developments, and share tips and discoveries.
The book, "eXist: a NoSQL Document Database and Application Platform" is currently being printed and is available from O'Reilly.com.
The exist-open mailing list is the primary forum for asking questions and getting help. Finding the answer to a question can sometimes be as simple as searching the mailing list's archives. Whether you have a question that you can't find the answer to, or you just want to join the discussion, subscribe to the mailing list—it's free and you can unsubscribe anytime.
Please consult this page for tips how to best report issues.
Besides exist-open, there is a mailing list dedicated solely to the XQuery language: the xquery-talk mailing list. It's a great place to ask questions about XQuery, from basic to advanced.
Follow @existdb on Twitter for news and announcements about eXist-db, and use the #existdb hash tag (note no dash in #existdb). Find links about eXist-db on Del.icio.us using the existdb tag. Meet the eXist-db professionals on LinkedIn. Subscribe to the eXist Developer Blog, powered by the eXist-based AtomicWiki project.
eXist-db began as and continues to thrive as an open source community, built on the contributions of volunteers. Recognizing the need for professional solutions for eXist-db, members of our development team and community have come together commercially under the umbrella of eXist Solutions. They are available for Consultancy, Training or Bespoke Development on a flexible basis, as such if you need some extra support or development resource, please contact us at firstname.lastname@example.org. eXist Solutions also provides Support subscriptions with service level agreements tailored to customer's requirements.