Taxonomy and Thesaurus Catalog

Open and Free

This catalog is a curated reference to publicly available taxonomies, thesauri, and controlled vocabularies across domains— from e-commerce and visual arts to biomedical research and software security.

Each entry includes:

▷ a link to the source

▷ a brief description of scope and structure

The resources are organized by category theme, to help you find relevant knowledge organization systems for your domain, whether you’re building semantic infrastructure, researching classification standards, or simply exploring how different fields have solved the problem of naming things consistently.

❗️Note: This is a living document; I update it regularly as I discover new resources or existing ones evolve. If you know of a taxonomy or thesaurus that belongs here, DM me and I’ll add it.