Michael Heim (1943-2012) was a highly respected professor of Slavic languages at UCLA. He spoke 10 languages (though he claimed that the number is hard to tie down due to the slippery political nature of language-dialect distinctions). Heim believed that effective language learning must begin (and progress) with a specific purpose in mind; he never learned a language just for the heck of it.
Pronounced like the word “link” (not “ling-kyu” as it is often mispronounced), LingQ is an an online and iOS app based language learning system created by Steve Kaufmann. The “freemium” site allows users to easily look up and save unknown words and phrases (what they call “LingQing”, hence the name of the site)m with tools for 11 languages: Chinese (Mandarin), English, French, German, Italian, Japanese, Korean, Portuguese, Russian, Spanish, and Swedish (which happen to be the same 11 languages Steve speaks).