The UMaine System (UMS) and Maine Community College System (MCCS) offer a wide range of courses High School students can access for free (up to 12 credits per year). More information is available online:

UMS - University of Maine Early College
MCCS - Maine Community College System Early College
UMA Early College Video Tutorials
Explore EC Portal -To apply for an early college course, you will need to create an account through the Explore EC portal.