My Catholic Faith Delivered™ is a website that offers online courses to Catholics of all ages. They first came to my attention because they had taken the very popular Faith and Life series (Ignatius Press) and put those into an online format. Since then they have expanded in a number of directions and they continue to grow and improve all of their resources.
The site also offers the Didache series "Complete Courses" for high school, college, and adult students. More recently they have added courses for catechist training.
Everything on My Catholic Faith Delivered is "magisterium faithful," making this a trustworthy source for Catholic education. The online delivery option also makes religious education courses for homeschoolers more affordable.