EPEL

CentOS/RHEL 7

# rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

CentOS/RHEL 6

# rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

CentOS/RHEL 5

# rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

RPMForge

CentOS/RHEL 7 x86 64bit:

#rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm

CentOS/RHEL 6 x86 64bit:

#rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm

CentOS/RHEL 6 x86 32bit:

#rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.i686.rpm

CentOS/RHEL 5 x86 64bit:

#rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm

CentOS/RHEL 5 x86 32bit:

#rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.i386.rpm
REMI

CentOS/RHEL 7

#rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

CentOS/RHEL 6

#rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

CentOS/RHEL 5

#rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-5.rpm

ATrpms

 CentOS/RHEL 7 x86 64bit:

#rpm -Uvh http://dl.atrpms.net/all/atrpms-repo-7-7.el7.x86_64.rpm

CentOS/RHEL 6 x86 64bit:

#rpm -Uvh http://dl.atrpms.net/all/atrpms-repo-6-7.el6.x86_64.rpm

CentOS/RHEL 6 x86 32bit:

#rpm -Uvh http://dl.atrpms.net/all/atrpms-repo-6-7.el6.i686.rpm

CentOS/RHEL 5 x86 64bit:

#rpm -Uvh http://dl.atrpms.net/all/atrpms-repo-5-7.el5.x86_64.rpm

CentOS/RHEL 5 x86 32bit:

#rpm -Uvh http://dl.atrpms.net/all/atrpms-repo-5-7.el5.i386.rpm

Webtatic

CentOS/RHEL 7:

#rpm -Uvh http://repo.webtatic.com/yum/el7/webtatic-release.rpm

CentOS/RHEL 6:

#rpm -Uvh http://repo.webtatic.com/yum/el6/latest.rpm

CentOS/RHEL 5:

#rpm -Uvh http://repo.webtatic.com/yum/el5/latest.rpm

Источник:

http://tecadmin.net/top-5-yum-repositories-for-centos-rhel-systems/