Fityk [fi:tik] ay isang programa para sa pagproseso ng data at nonlinear Captcha *.

Pangunahing ginagamit

• sa pamamagitan ng mga siyentipiko who analyse data from powder diffraction, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, and other experimental techniques,

• to fit peaks – bell-shaped functions (Gaussian, Lorentzian, Voigt, Pearson VII, bifurcated Gaussian, EMG, Doniach-Sunjic, etc.),