nethack-el is an Emacs major mode for playing nethack. Separate buffers are used for the map, status, messages, and menus. It features customization of keys and colors and user programmable hooks on game events. It supports GNU Emacs 20/21 and XEmacs 21, with graphical tiles on *Emacs 21.
refdb-mode is a minor mode for Emacs that implements an interface to RefDB, a reference management and bibliography tool for SGML, XML, LaTeX, and Muse documents. It integrates nicely with psgml, nxml-mode, AucTeX, and muse-mode. refdb-mode provides the complete functionality of the RefDB command line clients from a graphical interface. You can add and edit references, notes, and styles, run queries, and insert the results as citations into your DocBook, TEI, LaTeX, or Muse documents. You can also look up cited references in the database right from your document. You can create, transform, and view these documents with a mouse click. This amounts to an integrated authoring environment for markup languages with reference management and bibliography support.
xslide is a major mode for (X)Emacs for editing XSL Stylesheets. Its features include an XSL customization group for setting some variables; an initial stylesheet which is inserted into empty XSL buffers; a "template" menu for jumping to template rules, named templates, key declarations, and attribute-set declarations in the buffer; an "xsl-process" function that runs an XSL processor and collects the output; syntax highlighting; an "xsl-complete" function for inserting element and attribute names; an "xsl-insert-tag" function for inserting matching start- and end-tags; automatic completion of end-tags; automatic indenting of elements with user-definable indentation step; and a comprehensive abbreviations table.