As described by ChatGPT.
here are several online tools available that can help you build taxonomies. Here are some options.
SimpleTag: SimpleTag is a free tool that allows you to create, manage, and apply tags to your content. It has a simple interface that makes it easy to build and organize your taxonomy.
Smartlogic Semaphore: Smartlogic Semaphore is a more advanced tool that helps you create complex taxonomies, ontologies, and knowledge graphs. It uses AI and machine learning to suggest and validate concepts, and it integrates with various content management systems.
Synaptica: Synaptica is a powerful tool for creating and managing taxonomies, thesauri, and controlled vocabularies. It has features like automatic term extraction, hierarchical relationships, and multi-lingual support.
PoolParty: PoolParty is another popular tool for building taxonomies, ontologies, and knowledge graphs. It has a user-friendly interface and supports various standards like SKOS, RDF, and OWL.
TopBraid Composer: TopBraid Composer is a comprehensive tool for building and managing semantic models, including taxonomies, ontologies, and RDF graphs. It has a visual modeling interface and supports various standards and languages.
These tools vary in their complexity, features, and pricing, so it's important to evaluate them based on your specific needs and requirements.