Artha is described as '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' and is a Dictionary in the education & reference category. There are more than 25 alternatives to Artha for a variety of platforms, including Web-based, Android, Windows, Linux and iPhone apps. The best Artha alternative is GoldenDict, which is both free and Open Source. Other great apps like Artha are Wordnote Dictionary, Dictionary.com, WordWeb and GoldenDict-ng.
WordNet is the basis of Artha.