mrepo builds a local RPM repository from local ISO files, downloaded updates and extra packages from 3rd party repositories. It takes care of setting up the ISO files, downloading the RPMs, generating metadata and providing PXE/TFTP resources for remote installations.
RPM packages can be download by various means using ftp, http, rsync, reposync, sftp, RHN or YOU.
It was primarily intended for doing remote network installations of various distributions from a laptop or USB disk without the need for CD media or floppies, but is equally suitable for an organisation's centralized update server.
For updating your local systems, configure either Yum, Apt, or up2date and point them to your local mrepo server.