For CentOS/RHEL, additional common packages are available at:
- EPEL 6 (i386): http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
- rpmforge (i386, EL 6): http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm
For instance, tmux is available on EPEL while htop is available on rpmforge.