Tribune50 is a structured web directory that maintains a continuously updated catalogue of active websites organised by subject classification. The index was established to serve as a neutral, open-access reference for anyone seeking to locate web operators across a defined set of industries and subject categories. The catalogue currently holds 835 indexed entries distributed across 22 classifications, ranging from specialist fields such as Dentistry & Oral Medicine and Legal Practice & Jurisprudence to broader sections including General Reference and Computing & Information Technology. Each entry is reviewed before inclusion and carries a brief descriptive notation to assist in identification. Tribune50 operates on an open-submission model: any operator of a qualifying web property may submit a site for cataloguing free of charge and without registration. Submissions are processed in order of receipt and are subject to editorial review before appearing in the index. The index is maintained as a reference work rather than a promotional channel. Tribune50 does not provide rankings or editorial assessments of listed properties. Sites are catalogued in the section that most accurately reflects their primary subject area, as determined at the time of submission. Tribune50 is part of a broader network of open web directories, each maintained independently with its own classification scheme and editorial voice. The directory is updated on a rolling basis as new submissions are reviewed and approved.