XSLT-process is a minor mode for (X)Emacs that allows you to run a Java XSLT processor on a buffer and display the result in another buffer, or in a browser. You can also run the XSLT processor in debugging mode, setup breakpoints, run step by step, view local and global XSLT variables, and many more.
BlogMax makes it easy to use Emacs to maintain a Web log. You define templates and an FTP site for uploads. Most of your site's content is defined by text files. Saving a text file automatically wraps the template around it, expands macros and shortcuts, and saves the HTML file. Other commands in "weblog" mode upload files via FTP, create an RSS file, yank links or blockquotes into the buffer, create shortcuts, etc. The BlogMax Web site was, of course, created with BlogMax. It has been tested in Emacs 20.3.1 on Windows and Emacs 20.4.1 on Mandrake Linux.
ics.el is a comint based Emacs major mode for handling the text portion of communications with internet chess servers such as FICS and ICC. It is written in Emacs-Lisp and works best in conjunction with a graphical interface such as Xboard. It handles colour highlighting and "buttonisation" (making certain portions of text active so that, for example, you can challenge opponents with a single mouse click) as well as command recall and editing and automation of commands based on regexps seen in the ICS output, all highly customisable using Emacs lisp.