2010-03-04, 01:34 PM
Fedora, CentOS, RHEL are all derived from RedHat, and all use the Redhat Package Manager (or RPM) system for software management. SuSE and Mandrake/Mandriva also use RPMs. YUM is the preferred front-end to RPM.
Ubuntu (and Lesbian) derive from Debian, which uses the DPKG system instead. Their preferred front-end is APT.
Generally, applications found for one distro will usually be ported to another in some form - jsut that obtaining it could be different.