Colophon80 is a manually maintained directory of websites, organised into 22 clearly defined subject sections. The catalogue is built on a simple premise: the open web contains far more useful, interesting, and active sites than algorithmic search surfaces on a given day. Our aim is to provide a browsable, organised record of that web. Each entry in the index was submitted by the site owner and reviewed by the curator before being listed. The filing process is straightforward: a site is evaluated for basic operational quality and placed in the most appropriate section. Entries are not ranked against each other within their sections; alphabetical order and submission sequence are the only organisational principles applied. The 22 sections cover a wide range of topics — from health services and legal practice to gaming, food, construction, and technology. A general Open Catalogue section accommodates sites that do not fall cleanly into any of the defined categories. Colophon80 is intended to be comprehensive within its scope, and the index grows with each accepted submission. Submitting a site is free and straightforward. The form on the Add a Site page asks for a URL, a short description, and a section selection. Once submitted, entries enter a review queue and are published after a brief editorial check. There are no listing fees and no renewal requirements for standard listings. Colophon80 operates as a reference tool for browsers, researchers, and anyone who prefers a structured directory to an unfiltered search. The index is updated regularly as new submissions are processed.