Free, comprehensive, feature-rich, easy-to-use, off-line English thesaurus

Mobysaurus Thesaurus is a free, comprehensive (over 30,000 headwords and 2,500,000 synonyms), feature-rich, easy-to-use, off-line English thesaurus that helps you write and speak better by leading you to the right word for every purpose or occasion. Other features include cross-referencing, headword suggest, fast wildcard search, ability to find related/synonymous headwords (which is the fastest and simplest way for serious word hunters like you to go deep for the ultimate synonym of choice, from the word you are working with), keeping search history and favorites across sessions, system-wide hot key support (which automatically looks up highlighted words in most programs), online referencing, tabbed interface, full-text clipboard/print support, suggest-as-you-type and auto-completion, WordWeb support and more.