1)   WordMaestro 1.50
The all-in-one thesaurus, English dictionary, anagram solver and word finder for Windows. Integrates seamlessly with other programs e.g. MS Word and Outlook.
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 2)   ThesaurusToGo for Palm 2.0
Enjoy ThesaurusToGo for Palm version 2.0 for 10 days FREE! Or, purchase a single license for $8.
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 3)   SpellExpress(tm) -- Instant Spell-Check, Thesaurus & Dictionary 2.6
SpellExpress provides instant access to a spell-check and thesaurus directly from your desktop. With SpellExpress you can spell-check a word or phrase and find meanings, synonyms, and antonyms from any application.
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