The Italian-French X-shooter GRB host program started at the end of 2009 and allowed us
to collect the spectra of about 30 host galaxies in the 300–2400 nm range from a redshift
of about z = 0.1 to z = 2.7. We are using these spectra to retrieve information on the
host metallicities, star formation rates and extinctions. An accurate slit positioning
allowed us to discover in some cases close-by galaxies at the same redshift than the GRB
host. Thanks to the comparison of the afterglow and host spectra, it is possible to assess
for possible interactions of these systems. We also looked for the counterparts of the
foreground absorbers present in the afterglow spectra, but we obtained very few
identifications.