Compendium16 is a web directory organised along encyclopedic principles. Rather than employing algorithmic ranking or editorial curation, the directory presents submitted resources within a stable subject classification scheme, allowing visitors to browse systematically through areas of interest. The directory currently catalogs 832 active resources distributed across 22 subject sections. These sections correspond to broad fields of online commerce and information, from clinical health services and legal practice to gaming, travel, and general retail. Each section functions as a discrete chapter within the broader compendium. Resources are listed following submission and review for categorical accuracy. The review process is concerned solely with correct classification rather than editorial endorsement. Compendium16 does not assess the quality, reliability, or commercial standing of listed resources — it serves as an index, not a recommendation engine. The compendium format draws on a long tradition of reference publishing, wherein the value of an index lies in its comprehensiveness and the consistency of its organisation. Users who know what field they are searching within will find that systematic browsing yields a more complete picture than any single search query could provide. Submission of a resource to Compendium16 is free of charge and open to operators of any legitimate online enterprise. Submitted resources are assigned to the most appropriate subject section by the editorial team. The directory is maintained as a public reference instrument and is updated as new submissions are reviewed and accepted.