Duolingo

Auditory and Visual Learners
Duolingo is a free website and app for smart phones to learn other
languages. One of the biggest advantages of Duolingo is that it works
to many learning styles based on the various exercises used to learn a
new language.  For each language Duolingo breaks down skill and
lessons in each of those skills.

As part of the skills, the user may repeat a phrase or sentence, type
the English version of the language from a spoken sentence or print of
a sentence, type the language version from a print of a sentence, type
a word based on a picture.

In our house, as English speakers, we are learning Spanish and German.
We have used Rosetta Stone before as well to learn Spanish.

Duolingo is free! It moves much faster than Rosetta Stone so you have
to do your own review. It's very easy to go back to any lesson and
re-do it. Duolingo will have you go back to skills occasionally, but
we have found that we need to review them much more frequently than
suggested.

Duolingo also assigns XP's for each skill that you complete
successfully. For learners that are competitive and are motivated by
earning incentives, Duolingo provides the ability to keep you
motivated.