CL-HTTP-PARSE is a slash and burn port of Franz's phtml HTML parser.
I made a few small changes to the source mainly involving the call to excl:intern* in collect-tag. In particular, all tags are now string-upcased before being interned. There is probably a better solution but I'm not very Allegro savvy.
Any questions or concerns should be directed to me, Gary Warren King at email@example.com.
(html-parse:parse-html "Parsing HTML is Phun
Parsing HTML is phun because angle brackets are better than parentheses.
((:HTML (:HEAD (:TITLE "Parsing HTML is Phun")) (:BODY (:H1 "Why is it phun?") (:P "Parsing HTML is phun because angle brackets are better than parentheses."))))
==> ((:HTML ...))