The PhrontisterySave
A site for lovers of obscure and unusual words, featuring a dictionary of rare words, word lists of vocabulary on specific topics, essays and discussions on etymology, vocabulary and language usage. http://phrontistery.info/
VocabularyMail.comSave
A free daily email broadcast of one to three words, their definitions, and explanations and examples of how to use them effectively in your speech and writing. http://vocabularymail.com/
Vokabeln.netSave
Web-based vocabulary trainer with a multilanguage interface. Features shortcuts for special characters used in ~100 languages. http://www.vokabeln.net/