Repo for Centos

For x64

# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm && wget http://rpms.famillecollet.com/enterprise/remi-release-7.rpm && wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm && rpm -Uvh remi-release-*.rpm epel-release-*.noarch.rpm rpmforge-release-*.rpm

and x86...

# wget http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm && wget http://rpms.famillecollet.com/enterprise/remi-release-5.rpm && wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm && rpm -Uvh remi-release-5*.rpm epel-release-5*.rpm rpmforge-release-*.rpm

for both of them.

wget -q -O - http://www.atomicorp.com/installers/atomic |sh