Both ACE and NCCRS are credit recommendation organizations that have evaluated Study.com courses and recommended them for the levels of credit that they have deemed appropriate.
You can see a list of Study.com ACE and NCCRS credit recommended courses here: http://study.com/academy/college-accelerator-hub/what-is-ace-why-accreditation-matters.html
ACE is the American Council on Education and they have partnered with 2,000 schools and universities to accept their nationally credit recommended courses.
You can see a list of their schools here: http://www2.acenet.edu/CREDITCollegeNetwork/
NCCRS is the National College credit Recommendation Service and they have partnered with over 1,500 schools and universities to accept their regionally credit recommended courses.
You can see a list of their schools here: http://www.nationalccrs.org/colleges-universities-search
When considering getting credits through Study.com, for either credit institution, we always recommend checking with your school about their credit-consideration policies regarding these organizations. Every institution sets its own policies and its best to know your school's policy before you begin your Study.com coursework.