http://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F
Visit the above URL, choose your version and architecture and install it. EPEL has a lot of missing and extra packages that rpmforge does not.
For old versions of EPEL that are deprecated, eg. 5, 6 find them from the archives:
For Centos 5
#update EPEL for Centos 5 is now archived and not really supported but can be downloaed from here:
rpm -ivh https://archives.fedoraproject.org/pub/archive/epel/epel-release-latest-5.noarch.rpm
rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-5.noarch.rpm
For Centos 6
rpm -ivh http://archives.fedoraproject.org/pub/archive/epel/6/x86_64/epel-release-6-8.noarch.rpm
For Centos 7
rpm -ivh http://archives.fedoraproject.org/pub/archive/epel/7/x86_64/Packages/e/epel-release-7-12.noarch.rpm
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