NASA Thesaurus [ http://www.sti.nasa.gov/nasa-thesaurus.html ]
National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms. - [ Read more ]

Alcohol and Other Drug Thesaurus - AOD [ http://etoh.niaaa.nih.gov/AODVol1/Aodthome.htm ]
National Institutes of Health thesaurus. Provides resource for medical, social, and demographic terms related to alcohol and drug use. - [ Read more ]

ANSI/NISO Z39.19 Monolingual Thesaurus Creation Standard [ http://www.niso.org/standards/resources/Z39-19.html ]
Download site for Z39.19 thesaurus creation standard, which is enumerative and monolingual in nature. - [ Read more ]

Concept Space [ http://conceptspace.london.edu/ ]
Management education thesaurus from the London Business School organizes terms into a solar system of related ideas. - [ Read more ]

WordNet - a Lexical Database for English [ http://wordnet.princeton.edu/ ]
An on-line lexical reference system whose design is inspired by current psycholinguistic theories of human lexical memory. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept. Different relations link the synonym sets. From the Cognitive Science Laboratory, Princeton University - [ Read more ]

Roget's Interactive Thesaurus [ http://thesaurus.reference.com/ ]
Roget's Thesaurus of English words and phrases. - [ Read more ]

Bartleby.com: Reference [ http://www.bartleby.com/reference/ ]
Includes "Roget's International Thesaurus of English Words and Phrases" and Houghton-Mifflin's "Roget's II: The New Thesaurus," third edition. - [ Read more ]

WWWebster Thesaurus [ http://www.m-w.com/thesaurus.htm ]
Merriam-Webster Thesaurus - [ Read more ]

Library of Congress Classification Schedules [ http://www.loc.gov/catdir/cpso/lcco/lcco.html ]
A comprehensive list of LOC Classification schedules. - [ Read more ]

Historical Thesaurus of English [ http://www2.arts.gla.ac.uk/SESLL/EngLang/thesaur/homepage.htm ]
Contains the vocabulary of English from the earliest written records to the present, with known recorded dates of usage, taken from the Oxford English Dictionary. - [ Read more ]

Babynames Thesaurus [ http://www.yourbabysname.com/thesaurus.htm ]
You can search for a name from its meanings. The site has more than 10,000 names with meanings. - [ Read more ]

Library of Congress Thesauri [ http://www.loc.gov/lexico/servlet/lexico ]
Links to multiple LOC thesauri, including GLIN, the Global Legal Information Network. - [ Read more ]

Art and Architecture Thesaurus [ http://www.getty.edu/research/conducting_research/vocabularies/aat/ ]
Getty's terms, as used in several AAT indexes. - [ Read more ]

Phrases Thesaurus [ http://www.phrasefinder.co.uk ]
A resource for writers. Enter a single word and it will return a list of phrases and sayings that are related to the word in some way. In English. - [ Read more ]