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Autonomous Technology-Assisted Language Learning (http://en.wikibooks.org/wiki/ATALL)
From wikibook.
A Place to Start in Selecting Software by Deborah Healey and Norman Johnson.
A comprehensive list of CALL software (English only)
CALL Software Database maintained by Fred Riley
English is probably the most widely spoken language worldwide. There's a vast amount of learning resources on the web.
NPR.ORG: a non-profit American media organizations, a good source of news and podcast
starfall: a free on-line service to help children learn to read, featuring interactive books, games, and many other reading exercises. It's fun and useful. My toddler son loves it so much!
http://www.dicts.info/
A huge collection of dictionaries as well as a list of dictionary applications, such as vocabulary trainers and dictionaries for mobile phones and PDAs.
http://wiktionary.org/
multilingual dictionaries
http://www.stardict.org
multilingual dictionaries
http://www.thefreedictionary.com
English only, with free audio pronunciations!
http://dictionary.reference.com/
For English, but also returns simple translations in other languages. Audio pronunciations available for premium members only.