The Cliffites, being followers of Tony Cliff, namely, those parties influenced by the United Kingdom's Socialist Workers Party and last time I checked internationally being the International Socialist Tendency even after splits, tend to heavily refer to Luxemburg alongside Trotsky and Cliff obviously.
Wiki cites: "Rosa Luxemburg's conception of the structure of the revolutionary organisation — that they should be built from below up, on a consistently democratic basis — fits the needs of the workers' movement in the advanced countries much more closely than Lenin;'s conception of 1902—4 which was copied and given an added bureaucratic twist by Stalinists the world over." Tony Cliff Rosa Luxemburg, London, 1959, p.54 cited in John Callaghan The Far Left in British Politics Oxford: Basil Blackwell, 1987, p.95.
They also cite: "Rosa Luxemburg’s place in history", (1959) marxists.org which is pretty effusive.