Fen is a web directory that catalogues publicly accessible websites and organises them into twenty-two subject-based categories. The directory was established to provide a structured means of browsing the web by topic, functioning as a classified index rather than a search engine driven by algorithmic ranking. Each entry in Fen is reviewed by an editor before inclusion and assigned to the category that most accurately reflects its primary subject matter. Sites that span multiple disciplines are placed in the category representing their principal focus, while broadly themed sites are listed under General Reference and Unclassified. The directory currently contains 832 approved entries. The categories in Fen span a wide range of human activity, from Jurisprudence and Legal Services to Geographic Exploration and Travel. Within each section, entries are presented with a title, the site's domain, and a brief editorial description to assist in evaluating relevance. Users may also browse recently submitted entries on the home page. Fen accepts submissions from website operators who wish to add their site to the appropriate section. The submission process is free of charge and open to sites of any subject that fall within the scope of an existing category. Submitted entries are reviewed before publication, and sites that do not meet the directory criteria may not be listed. The directory is intended as a reference tool and does not represent any commercial relationship between Fen and the listed sites. Inclusion in the directory is not an endorsement; it is a classification.