As I get back into using CENTOS, I will be posting a few guides on various things I find. One of the first things is to install RepoForge (formerly RPMForge) to give a number of programs such as htop that I really missed.
So, to get started, download this rpm:
The next step is to install it:
rpm -ivh rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm
And finally, update yum
And the repo is now installed and updated, feel free to install any packages you need.