One popular tool is called Visuwords, which is a free online graphical dictionary and thesaurus that uses WordNet as its source. Visuwords allows users to enter a word or phrase and view a graphical representation of related words, synonyms, antonyms, and other associated concepts. The resulting graph can be manipulated by zooming in or out, clicking on nodes to reveal more information, and dragging nodes to rearrange the layout.

Another tool is called WordNet Explorer, which is a standalone application for Windows that provides a visual interface for exploring the WordNet database. WordNet Explorer allows users to view synsets, hypernyms, hyponyms, meronyms, and other linguistic relationships using an interactive tree-based display. The tool also includes features such as search, filtering, and exporting of data.

Other similar tools include WordNet Domains Browser, WordNet Visualizer, and WordNet Navigator. These tools can be useful for researchers, linguists, educators, and anyone else interested in exploring the rich semantic relationships contained within the WordNet database.