The software is very easy to use and provides estimates of: AGN continuum luminosities and slopes at several restframe wavelengths; luminosities, widths and velocity offsets of 20 emission lines; luminosities of iron blended lines at optical and UV wavelengths; and host galaxy luminosities.  QSFit fits all the components simultaneously using an AGN continuum model which extends over the entire available spectral range, in order to probe the broad-band AGN continuum and avoiding influences of localized features in the spectrum.  The QSFit code is released as free software, and the whole fitting process is customizable for specific needs. I will also present a new catalog of spectral properties of 71,251 SDSS spectra of AGN with z < 2, analyzed with QSFit.  Such catalog allowed us (for the first time) to estimate the AGN continuum slope on a very large sample, and to show that there is no evident correlation between the continuum slopes and the redshift.