Dictionaries
- 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.
- Germ Searchable WordNet and Roget's Thesaurus with meaning trees.
- INGRID Library Thesaurus Allows direct term search with results hyperlinked to broader and narrower search terms. Available in English and Estonian.
- Phrases Thesaurus 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.
- Plumb Design Visual Thesaurus (Neat!)
- Roget's International Thesaurus of English Words and Phrases Online publication of this popular thesaurus made available by Bartleby.com.
- Roget's Thesauri. Bartleby.com Roget's Thesauri. Bartleby.com
- Roget's Thesaurus - As distributed by Project Gutenberg E-text of Roget's Thesaurus No. Two, which is derived from the version of Roget's Thesaurus published in 1911.
- Roget's Thesaurus Headwords
- Specialized On-line Thesauri on the Web On this site you will find short descriptions and references to classification schemes and thesauri available on the WWW.
- WordNet - a Lexical Database for English 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
- Wordsmyth Educational Dictionary-Thesaurus Integrated english dictionary and thesaurus.
- WWWebster Thesaurus Merriam-Webster Thesaurus
- Yahoo! Roget's II Thesaurus Contains over 260,000 synonyms and cross-references. Features succinct word definitions and hyperlinked category index.

