The Society of Friends (i.e. Quakers) in the US founded a number of excellent schools and colleges over the years. I have no idea which ones might still be under Quaker jurisdiction and which are currently secular and only historically Quaker.

A number of expensive private K-12 and 9-12 schools include the word "Friends" in their names, almost as many as include the words "Country Day." One prominent example is the Washington, D.C. area school attended by the President's daughters (and the offspring of other recent Presidents as well, e.g., Chelsea Clinton).