url-rewrite
URL-REWRITE programmatically rewrites (X)HTML documents such that certain attributes values are replaced by others. It was originally written to rewrite URLs for cookie-less session handling.

This one's by Edi Weitz and can be found at http://weitz.de/url-rewrite/.

ASDF-install package (obsolete) http://weitz.de/files/url-rewrite.tar.gz

HTML parser