General Sites:

• Conjuguemos Multi-Lingual Verb Conjugation Site
• Word Champ - The Language Learning Network 

Language-Specific Sites:

• StudySpanish.com
• Spanish Grammar
• My Spanish Dictionary
• Interactive Spanish Grammar
• On-Line Interactive Stories in Spanish
• Spanish Grammar Exercises
• Spanish-English Translation Games
• Test Your Spanish Grammar
• French-English Translation Games
• Tennessee Bob's Famous French Links
• Word Reference (online dictionary, English, French, German, Spanish, Italian, Russian) 
• Test Your German Grammar
• Test Your Italian Grammar
• Test Your Russian Grammar