We recently heard about Clonlara, a school in Michigan in the USA where they believe that "a school must empower students to participate purposefully and eagerly in their own educations." Their philosophy is very student-centered. According to their website: "Clonlara School's mission is to provide programs and services that recognize and support a leaner's curiosity, strengths, interests and talents as the foundation of his/her educational experience and nurture the spark that every child is born with".
They also offer a home-based program, as they are firm believers in home education and have been supporting homeschoolers in the US and abroad for many decades.
PS. Thank you Sandrine for the information.