French

• http://www.laits.utexas.edu/fi/home - I absolutely love this website. It has everything!
• http://french.speak7.com/ 

German

• http://www.dw-world.de/dw/0„9572,00.html -You have to register, but it’s a great way to learn German
• http://userweb.port.ac.uk/~joyce1/abinitio/index.html 

Italian

• http://www.zapitalian.com/ 
• http://www.learnalanguage.com/learn-italian/

Spanish

• http://www.lingolex.com/spanish.htm
• http://www.123teachme.com/ - Has games, verb conjugations, text translator, grammar, quizzes, and more!
• http://www.studyspanish.com/
• http://spanish.speak7.com/

Chinese

• http://www.chinese-tools.com/learn/chinese - What I love about this site is the pinyin to character tool 

Japanese

• http://www.freejapaneselessons.com/
• http://www.learn-japanese.info/
• http://www.learnjapanesefree.com/
• http://www.learnjapanese.com/ - Has slang expressions, grammar, common phrases, vocabulary and more
• http://japanese-phrases.sakura.ne.jp/

Greek

• http://www.kypros.org/cgi-bin/lexicon - Greek to English, English to Greek Dictionary (Modern and Ancient Greek)
• http://www.101languages.net/greek/basics.html

Sign Language

• www.aslpro.com
• www.aslresource.com

Esperanto

• http://en.lernu.net/

General Language Sites

• http://www.fodors.com/language/ - Has Spanish, French, Italian, German, Arabic, Chinese, and Japanese
• http://www.omniglot.com/ - Has basic phrases in almost any language along with idioms and sayings
• http://www.wordreference.com/ - Any language (French, Italian, Spanish, Russian, etc.) to English dictionary 
• http://www.bbc.co.uk/languages/ - Basic phrases and vocab in French, Spanish, Greek, Chinese, German, Italian, and Portuguese. 
• http://www.languagehelpers.com/ - Has Chinese, Czech, French, German, Latvian, Portuguese, Russian, and Spanish
• http://www.smartphrase.com/index.shtml -Has Italian, French, German, Spanish, Greek, Dutch, and Portuguese. Random phrase generator 
• http://www.101languages.net/vocabulary/vocabulary.html - Has Danish, Dutch, Finnish, French, German, Italian, Norwegian, Portuguese, and Spanish
• http://www.livemocha.com/ - A few people have suggested this site, and it’s incredible. If you want to learn a language on your own, you need this. And it’s free!