"Family trees" of important models. Immediately below is a geneaology of Atmospheric General Circulation Models through the 1980s, by Paul Edwards. Below that is a genealogy of computer code for ocean models to 1996.

CCM: NCAR's Community Climate Model; ECMWF: European Centre for Medium-Range Weather Forecasts; GFDL: Geophysical Fluid Dynamics Laboratory (Manabe); GISS: Goddard Institute for Space Sciences (Hansen); NCAR: National Center for Atmospheric Research; UCLA: University of California, Los Angeles (Mintz, Arakawa). Copyright © 2010 Paul Edwards, reproduced by permission. See Edwards (2010).

NPS: Naval Postgraduate School, LANL: Los Alamos National Laboratory, UK: United Kingdom (Southampton Oceanography Centre and others). Source: Randall et al. (2018), fig. 12-8, p. 12.18

See also Kuma et al. (2023), Fig. 2, for a graphic geneaology of the atmospheric physics codes used in 167 models ca.1980-2022, identifying 12 families.