Is there a website that lists available online courses from reputable universities?

You have to google it school by school.

As a favor, I checked out “Yale online courses in English” and found these.

http://oyc.yale.edu/english

You can do the rest yourself.

PS. I got curious. Here’s what’s available at Harvard

ItunesU is super awesome. It has tons and tons of free courses about everything from lots of fancy colleges. Just download Itunes if you don’t have it already, ItunesU is a section in the Itunes Store.

These four may be of use to you:

Opencourseware Consortium

Education Portal

Open Culture

elearners

iTunes U.
MIT.
Academic Earth.