Maps & Atlases
Web Search Engines
Look up words or phrases with this online version of "Merriam-Webster's Collegiate Thesaurus."
The Phrase Finder
A professional writers' resource for generating ideas for headlines, ad copy, song lyrics, etc.
Another easy-to-use version of Roget's. Browse by headword or category.
Contains 50,000 headwords and very precisely defined synonyms.