Artha is a handy thesaurus based on WordNet with distinct features like global hotkey look-up, passive desktop notifications, regular expression based search, etc. Developed by Sundaram Ramaswamy
License: Open Source
Dictionary.com offers a more comprehensive online experience with a vast array of features and resources, while Artha focuses on offline accessibility and a streamlined, fast user experience. Both tools serve different needs, making them suitable for distinct user preferences.