Seeking Course Management Plugin

I have seen the two course management plugins on www.ads-software.com (https://www.ads-software.com/extend/plugins/tags/course-management), but neither meets my needs.

I’m looking for a plugin (paid or free) that will actually allow me to run an entire course online. I should have the ability to add content (text, video, audio) to each lesson I create, which students should complete before being allowed to move on to the next lesson.

Does anyone know of something like this out there? I’ve been searching and searching with no luck!

Thanks in advance!

Heather