Power Thesaurus - Power Thesaurus is a fast, comprehensive and easy-to-follow online thesaurus for writers...
Artha - Artha is a handy thesaurus based on WordNet with distinct features like global hotkey look-up...
Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
WordWeb - One-click lookup in any almost any Windows program; Hundreds of thousands of definitions and synonyms; The latest international English words; Works offline, or reference to Wikipedia and web references.
Tiny Thesaurus - A Whatsapp bot for all your wordly needs
GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.