TemaTres!

Artha is a handy thesaurus based on WordNet with distinct features like global hotkey look-up, passive desktop notifications, regular expression based search, etc.. Artha may be used as a free open-source replacement to the proprietary WordWeb Pro.

One-click English dictionary and thesaurus for Windows. Dictionary apps for mobiles, tablets and Mac desktop. In difference to Lingoes Translator you it is only a word-translator not a text-translator.The comprehensive English thesaurus and dictionary includes:Definitions and synonymsProper nounsRelated words5000 audio pronunciations150 000 root words220 000 word sensesFixed web reference tabs

WordNet® is a large lexical database of English. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations. The resulting network of meaningfully related words and concepts can be navigated with the browser. WordNet is also freely and publicly available for download. WordNet's structure makes it a useful tool for computational linguistics and natural language processing. »

VerbAce-Pro is an easy-to-use Desktop Translation Software.

30,000 root words, 2.5 million synonyms andrelated words

The Top Words Like website is a great resource for finding synonyms for any given word. More information such as examples and definitions are displayed.