Originally Posted by axolotl

There are several free language-learning websites out there which already offer far more than a single individual would be able to create. One such example is: https://www.duolingo.com/

If you have a basis in a foreign language, there's a useful free website for finding partners who want to do a language exchange (typically via Skype). For those of us who are native speakers of English, it's easy to find language partners for any other widely-spoken language, since there are many native speakers of other languages who wish to practice with a native English speaker. The Mixxer - a free educational website for language exchanges via Skype | The Mixxer

I have used both of these websites to improve my Spanish, and I could see significant improvement in my Spanish on a recent trip to Mexico.