Educational learning management system (LMS) software has traditionally served higher education. But over the past decade, several companies have rolled out K-12 versions. Some have even begun to cater explicitly to K-12 institutions. Edmodo, which I previously described as one part education LMS and two parts academic social media network, targets primary and secondary education. Schoology bridges the divide between the two with offerings for K-12 and higher education. You could call it one part Blackboard and two parts Edmodo.