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The initial set of programs was created around 1998 by Ignacy Misztal to
While general use of features of Fortran 90 enable dramatic reduction of complexity compared to an eralier versions of Fortran. Additional simplifications were achieved by less emphasis on computational efficiency as computers were becoming more powerful every year.
Over time, more and more programming was done by many people (see here), especially Shogo Tsuruta and lately Ignacio Aguilar.