Depois de fuçar pra caramba consegui uns bons repositórios para RHEl 5 e compartilho com vocês.
Epel – Extra Packages for Enterprise Linux
http://download.fedoraproject.org/pub/epel
RPM-Forge
Red Hat Enterprise Linux 5 / i386:
rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
Red Hat Enterprise Linux 5 / x86_64
rpm -Uhv http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
Red Hat Enterprise Linux 4 / i386
rpm -Uhv http://apt.sw.be/redhat/el4/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el4.rf.i386.rpm
Red Hat Enterprise Linux 4 / x86_64
rpm -Uhv http://apt.sw.be/redhat/el4/en/x86_64/rpmforge/RPMS/rpmforge-release-0.3.6-1.el4.rf.x86_64.rpm
Você sabe algum para a arquitetura s390x