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I have been using Language Transfer to learn Spanish, and it is easily the best system I have ever experienced, short of actually living in a foreign country (which is how I learned four of my five languages).
As far as I know, it is completely free but supported by donations. I have been paying $5 per month for several years now, completely worth it!
The languages they have are:
Awesome, I am glad that someone else has been enjoying it as much as me!