These are some pointers you might find interesting whether you're
doing XML/XSLT development, Java development, or you're just an Emacs
- PSGML - major
mode for editing SGML and XML files.
- xslide -
major mode for editing XSLT files.
- JDE - major mode for Java
- CEDET - a collection
of tools for Emacs, including speedbar, semantic, eieio and others.
- tools for processing DocBook documents.