nukeevangelist writes:  

PCMS PHP-Nuke Course Management System PCMS version 1.1

see more here :: Course management system [fully fledged]

aamato writes "Fully featured course management system (CMS) designed for PHP-Nuke. You can see it here. A working demo can be seen here.
Control your users, your courses and your lessons. Lessons can be Flash presentations, quizes, chats, HTML pages and downloads. Every lesson can have a forum. You can charge for your courses and lessons, using a credits system. Use any shopping module/content page to sell credits for users

see more her :: Course management system [fully fledged]