FF is a package to evaluate one-loop integrals written by G. J. van Oldenborgh, NIKHEF-H, Amsterdam. For the the algorithms used see preprint NIKHEF-H 89/17, 'New Algorithms for One-loop Integrals', by G.J. van Oldenborgh and J.A.M. Vermaseren, published in Zeitschrift fuer Physik C46(1990)425. DOI: 10.1007/BF01621031