Jerry Chen's XEmacs Lisp Hacks

mmm:

• An extension to support multiple-major-modes in a single buffer. Using this extension, you can basically attach any number of secondary major modes to different regions of a buffer that is in any other primary major mode. The regions in a secondary major mode will have their respective key-bindings and font-lock. A practical use is to allow editing Javascript, VBscript, and/or CSS codes with their own syntax highlighting in a HTML file.
• Current version: 0.12 - Nov. 1, 1999
• See screen snapshot
• Download source file, and an example of usage.

line-numbers-mode:

• A minor-mode to display line numbers for the text lines in a buffer. The code is optimized in that it uses least amount resources to display the line numbers. Line numbers can be displayed in any fore/background colors.
• Current version: 0.20 - Feb. 2, 1999
• See screen snapshot
• Download source file

vvb-mode:

• A minor-mode to display one or more vertical bars in a buffer so that you know how things are aligning up in the file, or if you are over a column limit. There are multiple ways to show the bars and a context menu can be popped up on a visible bar.
• Current version: 0.41 - May 9, 2002
• See screen snapshot
• Download source file

Info customization:

If you are tired of reading the XEmacs online documentation, Info, like that, you may try to use this piece of elisp code to beef up Info's display like this (Notice that you don't see the distracting *note notation anymore).

Info File for Tcl/Tk:

One day, I made those info files for Tcl/Tk manuals, just for the hell of it. My favorite languages are still elisp and perl, though.