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Software package SASfit for fitting small-angle scattering curves SASfit has been written for analyzing and plotting small angle scattering data. It can calculate integral structural parameters like radius of gyration, scattering invariant, Porod constant. Furthermore it can fit size distributions together with several form factors including different structure factors. Additionally an algorithm has been implemented, which allows to simultaneously fit several scattering curves with a common set of (global) parameters. This last option is especially important in contrast variation experiments or measurements with polarised neutrons. The global fit helps to determine fit parameters unambiguously which by analysing a single curve would be otherwise strongly correlated. The program has been written to fulfill the needs at the small angle neutron scattering facility at PSI (kur.web.psi.ch). The numerical routines have been written in C whereas the menu interface has been written in tcl/tk and the plotting routine with the extension blt. Author Information: Joachim Kohlbrecher (firstname.lastname@example.org) Ingo Bressler (email@example.com) Laboratory for Neutron Scattering Paul Scherrer Institut CH-5232 Villigen PSI Switzerland Tel: +41 (0)56 310 3165 Fax.: +41 (0)56 310 3131 SASfit is available for users analysing data taken at PSI SASfit has been developed at the Paul Scherrer Institute (PSI) and remains copyright of the PSI. SASfit is provided for users of the PSI facilities SASfit is provided "as is" and with no warranty. For license information see COPYING.txt. A paper about SASfit has been published in J. Appl. Cryst. (2015). 48, 1587-1598 doi:10.1107/S1600576715016544