Learning Management Systems (LMSs) are Information Technology (IT) platforms whose aim is the support of learning processes. Among the features a LMS provides we can find communication tools such as forums, evaluation tools such as questionnaires, or grade tools. A number of LMSs exist, both open-source (such as .LRN, Sakai, or Moodle) and proprietary solutions (such as Blackboard). Among the wide variety of existing LMSs, a crucial question that arises is, which LMS is more suitable for my necessities? This paper strives at answering this question based on a performance evaluation that compares three of the most widely used open-source LMS, namely .LRN, Sakai, and Moodle.