\input zb-basic \input zb-ioport \iteman{io-port 05648998} \itemau{Zahariev, Z.} \itemti{Software packages to deal with fuzzy systems.} \itemso{Todorov, Michail D. (ed.), Applications of mathematics in engineering and economics'33. 33rd international conference, Sozopol, Bulgaria, 8--14 June 2007. Melville, NY: American Institute of Physics (AIP) (ISBN 978-0-7354-0460-1/hbk). AIP Conference Proceedings 946, 271-278 (2007).} \itemab Summary: This paper investigates currently available software packages dealing with fuzzy inference systems. Fifteen packages are investigated and described here. Some comparisons are created. At the end there are some conclusions. \itemrv{~} \itemcc{} \itemut{fuzzy inference systems} \itemli{} \end