The EPEL repository runs from within the Fedora project, sharing resources ( including, importantly their source trees ) with the Fedora ecosystem; over the years its proven to be a large and helpful resource for anyone running CentOS Linux.
One key challenge they have however, much like CentOS Linux, is that the entire effort is run by a few people helped along by a small group of voulenteers. So while the package list they provide is huge, the people putting in the work behind it is small. A fallout from this is that over the years a significant chunk of packages in the EPEL repo are now orphaned. They once had a maintainer but either that maintainer has gone away now, or has other priorities.
A few days back, Steven announced that they were going to start working to drop these orphaned packages unless someone steps up to help maintain them. You can read his announcement here : https://lists.fedoraproject.org/pipermail/epel-devel/2014-November/010430.html
This is a great time for anyone looking to get involved with packages and packaging as a whole and wanting to contribute into the larger CentOS Linux ecosystem to jump in and take ownership of content ( ideally stuff that you care about, hence likely to keep it managed for a period of time ). They have a simple process to get started, document at the Joining EPEL page here : https://fedoraproject.org/wiki/Joining_EPEL and you can see a list of packages being orphaned on the urls from Steven’s post linked above.