Conjuguemos
An "online workbook" that lets students practice vocabulary, verbs and grammar. Includes French, German, Italian, Korean, Latin, Portuguese and Spanish languages. With a free account, students may record grades and keep track of their progress.
Duolingo
The philosophy behind Duolingo is that everyone should be able to learn a language for free. This site offers courses in Spanish, French, German, Italian and other languages.
WordReference
This free, online translation dictionary focuses on the language pairs of English-Spanish, English-French, English-Italian, Spanish-French and Spanish-Portuguese although other languages are represented.
For globetrotters and armchair travelers alike, offers conversational language learning in over 70 languages, from Arabic to Yiddish, including English for speakers of other languages. Additionally, users can enjoy fun cultural specialty units, or practice the more arcane languages of "Pirate" (for landlubbers) and "Shakespearean" English (bespeaking Merrie Olde England). Users can create a profile to save their progress between sessions.
Designed for middle and high school students and adults who have a basic foundation in English grammar and reading but need adapted reading material for a variety of subjects. It offers resources to help build background knowledge, conduct research and improve study skills.
Transparent Language Online offers over 100 languages. It includes tools for English language learners for speakers of over 30+ languages; it also includes an American citizenship test prep course. Also included are various learning activities to help you retain what you have learned.