Fow Microsoft windows
WordWeb is a one-click English thesaurus and dictionary for Windows that can look up words in almost any program. It works off-line, but can also look up words in web references such as the Wikipedia encyclopedia
Artha is a handy thesaurus that focuses on high usability, without trading off simplicity and ease of use. It has the following distinct features that increases its usability
The latest stable release of Artha is 0.9.1 .