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The goal of this paper is twofold. Firstly, we present F-VIPGI, a new versionof the VIMOS Interactive Pipeline and Graphical Interface (VIPGI) adapted tohandle FORS2 spectroscopic data. Secondly, we investigate thespectro-photometric properties of a sample of galaxies residing in distantX-ray selected galaxy clusters, the optical spectra of which were reduced withthis new pipeline. We provide basic technical information about the innovationsof the new software and, as a demonstration of the capabilities of the newpipeline, we show results obtained for 16 distant (0.65 < z < 1.25) X-rayluminous galaxy clusters selected within the XMM-Newton Distant ClusterProject. We performed a spectral indices analysis of the extracted opticalspectra of their members, based on which we created a library of composite highsignal-to-noise ratio spectra representative of passive and star-forminggalaxies residing in distant galaxy clusters. The spectroscopic templates areprovided to the community in electronic form. By comparing thespectro-photometric properties of our templates with the local and distantgalaxy population residing in different environments, we find that passivegalaxies in clusters appear to be well evolved already at z = 0.8 and even moreso than the field galaxies at similar redshift. Even though these findingswould point toward a significant acceleration of galaxy evolution in densestenvironments, we cannot exclude the importance of the mass as the mainevolutionary driving element either. The latter effect may indeed be justifiedby the similarity of our composite passive spectrum with the luminous redgalaxies template at intermediate redshift.

F-VIPGI: a new adapted version of VIPGI for FORS2 spectroscopy. Application to a sample of 16 X-ray selected galaxy clusters at 0.6 < z < 1.2