Edmodo is the virtual learning environment (VLE) of choice of several teachers at my school. Its built-in resources and curriculum, class social networking opportunities, grading, and communication tools are hard to beat. This is truly a great resource.
LMS (learning management systems) like Haiku and others - create online classes. www.myhaikuclass.com and https://moodle.org/ and http://www.blackboard.com/Platforms/Learn/Overview.aspx and https://www.edmodo.com/ and http://www.eboard.com/ (although I'm not fond of eboard)