Integrated English dictionary and thesaurus.
a Lexical Database for English
Interactive dictionary and thesaurus using a visual display for data navigation.
Online version of Roget's II: The New Thesaurus, 3rd edition.
As distributed by Project Gutenberg
3rd edition. Contains over 260,000 synonyms and cross-references. Features succinct word definitions and hyperlinked category index.
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.
Searchable WordNet and Roget's Thesaurus with meaning trees.