ROOT

CERN maintains copies of many versions of ROOT in CVMFS:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT

You can activate a particular version within your environment by sourcing the appropriate thisroot.sh script, for example:

source /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.13.02/x86_64-centos7-gcc48-opt/root/bin/thisroot.sh