Moodle
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Moodle is the world's most widely deployed LMS, trusted by universities, governments, and corporations for everything from K-12 to corporate training. It's free and open-source, so you own the data and code, and the plugin marketplace extends functionality for nearly any use case. Moodle's flexibility comes with a steeper learning curve than commercial platforms.
Ideal for educational institutions or organizations that can devote technical resources to customization and maintenance. Where commercial platforms like Cornerstone excel at turnkey deployment, Moodle excels at deep customization and total cost of ownership over time, especially for large learner populations.