Colorize is an Application for colorizing chunks of Common Lisp, Scheme, Elisp, C, C++, or Java code. It is the same colorizing engine as lisppaste made standalone. It's licensed under the MIT license, written by Brian Mastenbrook, and currently maintained by Brit Butler.

The source and up to date docs may be found on github.

This is an interesting example that acts like a server-side include of colorized Lisp code for HTML.