I think you were talking about Coursera's "specialisations," which are essentially a grouping of "signature track" courses with a project or exam at the end. All of the courses can be taken for free if you don't care about the special certificates, but the project is just for paying customers.

Udacity is running some "pay only" courses with Georgia Tech for its online masters program, too. Not sure about their other offerings, or about edX.