EdX is Harvard and MIT's open-source university, offering college-level courses free online. The very first class was in spring 2012. Currently, it offers classes from three universities: Harvard, MIT and University of California at Berkeley. In 2013, Wellesley, Georgetown and the 15-school University of Texas system will begin offering courses. Six more schools will be added in 2014, including several international universities.
Courses: As of spring 2013, EdX offers 26 courses, ranging from computer science to chemistry to economics to political science. Pictured here: Eric Lander in the introduction to his biology MOOC.
Focus: Opening elite college instruction to a much larger audience.
Sources for courses: Started with Harvard, MIT and the University of California at Berkeley.
Backed by: A consortium of universities headed by Harvard and MIT, which have put $60 million into the effort.
Status: Not for profit.
Leadership: President Anant Agarwal, an MIT computer science professor.