edX.org is a MOOC (Massive Open Online Course) provider established by MIT and Harvard They offer free classes on multiple topics and in many different formats. These courses are all free, or you can pay to get a certification at the end of the course.
Coursera teams up with the universities all around the world to provide free access to the world’s best educational resources. Take free classes online at your own pace and earn an optional certification of completion.
ALISON is a global online learning community. It is aimed at helping you develop and maintain important workforce skills by providing high quality education resources and courses that offer certification.
Harvard offers many online classes and also gathers resources from around the world and gives students and anyone else who wants to learn access. Check out all the free offerings they have.
Class Central is another MOOC platform that gives you access to even more online classes.
They even have a management and leadership section.