Lernu! is a website hosting several free multilanguage courses designed to teach Esperanto. The site features courses catering to different levels of difficulty, featuring vocabulary words, drills, and grammar instruction. Students who encounter an unfamiliar word can click to immediately see a translation in their language. Tutors grade the course by hand, and also answer any questions about the language. The site was launched December 21, 2002.
The site also contains Esperanto books and music, electronic mail and instant messenger-like services for registered users, games, forums, and information about upcoming Esperanto conferences.
Languages covered by Lernu! as at 20060415: