Foundry41 is a web directory maintained as a working daybook. Its purpose is straightforward: collect submissions from site operators, review them against a basic standard of legitimacy, and record the approved entries in one of twenty-two trade columns. The daybook model differs from algorithmically curated search results. Entries here are not ranked by traffic, domain authority, or advertising spend. They are ordered by the time they were entered into the record and remain listed for as long as the site is active and the entry has not been removed at the operator's request. Site operators submit through the Add a Site form on the Foundry41 homepage. The submission asks for a URL, a category, and a site title. No payment is required. After a basic review — checking that the URL resolves and that the site is not spam — the entry is posted to the appropriate column. Foundry41 covers twenty-two categories, from niche specialist columns counting fewer than ten entries to the general loose-castings column, which holds the largest share of submissions. Together, the twenty-two columns account for 827 active listings as of the most recent tally. The directory does not verify the claims made on submitted sites, endorse any listed business, or guarantee the accuracy of external content. Readers who find an entry that is out of date, broken, or otherwise unsuitable may contact the Foundry41 team to request its removal.