Artha is a free, open source cross-platform English thesaurus that works completely off-line and is based on WordNet. Is is available for GNU/Linux and Microsoft Windows. For a given word, the possible relatives shown by Artha includes Synonyms, Antonyms, Derivatives and many more.
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).