The current release version of Jetty is 9.4. Support is still provided for Jetty 9.2 and 9.3, and maintenance releases are provided for Jetty 7 and Jetty 8 when needed.
Official Jetty documentation is hosted on the Eclipse Jetty site. In addition to current version documentation, the site provides documentation for prior versions of Jetty. JavaDocs and Source XRef documentation for Jetty can be found on the Jetty Downloads page.