you can't expect to find a single site that teaches "almost all" languages, but
codecademy covers a good few, including javascript, python, ruby, and java. also HTML and CSS, if you want to do web stuff
it's nice and interactive, although honestly I wasn't a fan of the jquery course when I took it. that was a couple of years ago, maybe it's improved, but it was the first experience I had with programming and there were a lot of things it didn't quite explain, that I didn't know how to use until more recently
the other courses were better, though