Catalogue of black holes Where can one find a reliable list of black holes that have been discovered/observed so far, directly or indirectly, along with their properties, like mass, spin, etc.?
The Wikipedia list given by @NeutronCat in a comment contains this external link. This compilation by Wm. Robert Johnston has not been updated since 2004, but contains both stellar and supermassive black holes, along with some parameters (coordinates, distance, mass...).