The best increase in accessibility to education in decades was online education. Online courses have been fairly traditional college courses offered for credit directly by universities which eliminated distance barriers to college enrollment.
Massive Open Online Courses or MOOC's take online education to a new level offering the opportunity to learn to a much wider office accross institutions.
MOOC's operate off of platforms like Coursera, edX and Udacity. Each platform makes it possible for multiple universities such as the Penn State University and the University of Tokyo to offer classes to a wider audience.