Jubilee Centre (Birmingham), Aretai Centre (Genoa), Center for the Study of Moral Development (Alabama), Human Flourishing Program/Center (Harvard), Practical Wisdom Centre (Chicago), Center for Research on Adolescence (Stanford), Singapore Centre for Citizenship and Character Education, Civic Humanism Centre (University of Navarra, Spain), Program/Center for Leadership and Character (Wake Forest U.), Center for Character and Citizenship (St. Louis). I would also mention the Institute for Advanced Studies in Culture (U. of Virginia), although it is more sociological than educational.
There are some universities that are very strong in this area but have not established formal centres, for example The University of Humanistic Studies (Utrecht, Holland).
(Centre for Education in Virtues and Values, Madrid, Spain)
https://www.cerc.cz/
(Centre for Character Development, Hradec Kralove, Czechia)
and I would like to mention also our Department of Educational Studies at Trnava University which is the leading institution for the character education in general and ethical education as a school subject in Slovakia