<strong><em>ATutor</em></strong> is an Open Source Web-based <strong>Learning Management System (LMS)</strong> designed with accessibility and adaptability in mind. Administrators can install or update ATutor in minutes, create custom themes to give it a new look, and extent its functionality by enabling or developing feature modules. Educators can quickly assemble, package, and redistribute instructional content, and conduct their courses online. Students learn in an adaptive learning environment.