A feature-rich English thesaurus containing more than 2.5 million synonyms and related terms accessible offline.
Pros & Cons:
If you just want a thesaurus consider Mobysaurus Thesaurus. It's much more comprehensive than the thesaurus in either WordWeb and TheSage but lacks a separate dictionary.
Without the need of Internet access, you can search a word offline from over 2.5 million synonyms and related terms in the database of Mobysaurus. It integrates Moby Thesaurus II, Roget's Thesaurus, GCIDE Dictionary and WordNet; all are royalty-free, powerful and most suitable for everyday reference. However, if you go online, try also FreeThesaurus.net, which makes use of Moby Thesaurus database.
For wordsmiths, Mobysaurus is a must-have product. It is yet another outstanding free utility from the guys at DonationCoder. If you use Mobysaurus, do the right thing and support DonationCoder generously.
Note: Mobysaurus on Windows Vista x64, Win7/10 requires an updated dll file - download here.
Mobysaurus Thesaurus was reviewed by Gizmos Freeware on based on version 1.0.55.