Moodle

Moodle is the world's most widely used open-source LMS, offering unparalleled customization and control. It's a self-hosted platform favored by organizations with technical resources, allowing complete data ownership and tailoring. Its vast plugin directory enables features for every need, from adaptive learning to webinar integration. The core system is free, but costs arise from hosting, customization, and support.

It serves universities, schools, and corporations globally. Its ranking reflects its massive market presence, active developer community, and commitment to pedagogical principles. However, its out-of-box user experience can be less polished than commercial SaaS options, requiring setup effort.