byki.com — Byki language-learning software is a powerful and personalized language-learning system, designed to advance your new language proficiency by expanding your vocabulary reservoir.

multilingualbooks.com — The site to find the best language-learning books and software. Browse their collection and compare some of the best language-learning software available online.

linguascope.com —  The Linguascope website contains hundreds of language games and activities developed to match curriculum requirements. The games are organised in topic areas. Each topic area is composed of a series of activities and accompanied by a printable worksheet that can be used as extension or consolidation work at the end of a lesson, or for homework

radiolingua.com — Language-learning for your iPod, iPhone, mp3 player or computer. Take your lessons with you wherever you go by downloading free materials or purchasing courses to learn even more.

1-language.com — A one-stop resource site for learning English and other languages. Relevant, localised information for International students and people. Featured schools, language directory, multi-lingual content and more.

elanguageschool.net — eLanguageSchool.net is one of the largest websites for learning multiple languages on the Internet. It has compiled useful resources from a variety of sources to make learning any of ten different languages as easy as possible. And it's free!

single-serving.com — Quickly learn essential phrases and words for travelling, in easy single-serving doses! Great for beginners!

vocabulix.com —  Learn Languages free and online with Vocabulix.   Improve your vocabulary skills in foreign languages, online and free!   1. Vocabulary Builder - Learn Spanish vocabulary, learn German vocabulary or learn English (ESL) with over 90 predefined vocabulary lessons and share them with other online users (also: French, Italian, Portuguese, Czech...)   2. Verb drills - Learn Spanish verb conjugations, learn German conjugations or learn English conjugations with this efficient tool.   3. Verb conjugation tables - in Spanish, German and English.   4. Language Store - Buy language software, language CD's, tutorials, online language courses and other products.

how-to-learn-any-language.com —    If you are a foreign language enthusiast, a polyglot or just want to learn a new language on your own, you will find here: How to choose a new language to learn. A detailed, hands-on guide to teaching yourself a foreign language. Reviews of books about language learning. The questions about language learning people ask me most frequently. Read the most complete information on Mezzofanti, the world's most gifted polyglot, who spoke more than 40 languages fluently.  

digitaldialects.com — The Digital Dialects website features free to use interactive games for learning languages. Language sections are updated regularly and new sections are under development. This site requires the use of Macromedia Flash Player.

internetpolyglot.com — Internet Polyglot is designed to help you learn the foreign language of your choice. You can learn Spanish, French, Chinese or English even if English is your mother tongue and become a true polyglot. When you create your lessons you specify the languages that you want for your words and translations. For example, if you learn Spanish you may want to create lessons with Spanish as the word language and English as the translation language. When you want to learn English and your native language is Spanish you will want to create lessons with English as the word language and Spanish as the translation language. And when you are a native English speaker but want to improve your vocabulary, create lessons with English as the word and translation languages. Learning English is a lifetime process and one should not neglect it. 

ocw.mit.edu — The Massachusetts Institute of Technology provides all its course material for free. Here's the link to their foreign languages section - plenty of free PDFs!