cvmfs user guide:
https://cernvm.cern.ch/portal/filesystem
software distribution service based on http
storm user guide:
http://italiangrid.github.io/storm/documentation.html
storage resources and transfer management service based on srm protocol
voms server:
http://italiangrid.github.io/voms/documentation
central repository for user authorization information (for grid services), providing support for sorting users into a general group hierarchy, keeping track of their roles
dirac:
https://github.com/DIRACGrid/DIRAC
job management system in distributed environment
https://www.cnaf.infn.it/utenti-faq/