Founded by Harvard and MIT, edX offers more than 800 free, online courses as well as certificates from top universities around the world, including Harvard, MIT and UC Berkeley. The courses cover everything from literature to poetry, medicine, biology, urban planning, engineering, history and architecture.
Taught mostly in English, the courses have different weekly requirements, and generally require participants to be online at designated times of the day. There are also classes offered in other languages like Chinese, French, Spanish and Portuguese. They also offer certificates that can be purchased at the end of the course, costing between $50-$70.