About
RefTeX is a specialized package for support of labels, references, citations, and the indices in LaTeX. RefTeX wraps itself round four LaTeX macros: \label, \ref, \cite, and \index. Using these macros usually requires looking up different parts of the document and searching through BibTeX database files. RefTeX automates these time-consuming tasks almost entirely. It also provides functions to display the structure of a document and to move around in this structure quickly.
RefTeX was written by Carsten Dominik and is currently being maintained by the AUCTeX project.
Download
Since version 24.3 of Emacs, RefTeX is developed exclusively as part of Emacs. So if you want to get the latest version of RefTeX, you should get the latest version of Emacs. (Now outdated versions of the standalone distribution are kept for archeologic purposes on the GNU FTP server.)
Documentation
The RefTeX manual written in Texinfo is included in the distribution. Follow the link to read the online version for the current stable release. The manual is available in various formats, e.g. HTML, PostScript or PDF, if you don't like the info manual accessible with C-h i d m RefTeX RET in Emacs.
Mailings lists
Since RefTeX is mainained by the AUCTeX project, you can get support or report bugs on the AUCTeX mailing lists.