Free online courses/lectures

- Global Health eLearning Center: offers courses aimed at increasing knowledge in a variety of global health technical areas in early childhood development, maternal health, infectious diseases, health systems, gender and health, etc.
http://www.globalhealthlearning.org/courses

- Coursera: offers courses from top U.S. universities, including Stanford, in a wide range of topics, spanning the Humanities, Medicine, Biology, Social Sciences, Mathematics, Business, Computer Science, etc.
https://www.coursera.org

- Edx.org: Online courses from top U.S. universities including UC Berkeley available free or at low cost for a certificate.
http://edx.org

- John Hopkins Bloomberg School of Public Health offers free online courses: http://www.jhsph.edu/academics/online-learning-and-courses/
Courses are available on their OpenCourseWare program, Coursera, and iTunes U.