If you can't seem to find a software package you relied on in Red Hat Linux 9 in Fedora Core, you might be interested in this list. It shows packages from Red Hat Linux 9 that are not in the Fedora Core:
aumix-X11:???A gtk-based version of the aumix program.
exmh:???An X interface to the MH/nmh email handling system.
galeon:???A GNOME browser-based on Gecko (Mozilla rendering engine).
jdkgcj:???A free implementation of the Sun Java SDK.
kde2-compat:???A variety of compatibility libraries for the KDE desktop.
kernel-bigmem:???The Linux kernel configured for machines with 4 GB or more memory.
libelf-devel:???Development headers and documentation needed to develop applications using libelf.
libgtop-examples:???Examples of retrieved systems information used by libbtop.
lilo:???The LILO (LInux LOader) program for booting Linux or other operating systems.
LPRng:???LPRng printing software, for using and administering printers.
pine:???The pine mail user agent, including the pico text editor.
qt2:???The shared library for the Qt 2.x GUI toolkit.
qt2-designer:???An interface designer for the Qt toolkit.
qt2-devel:???Development files and documentation for the Qt GUI toolkit.
qt2-static:???The Qt GUI toolkit for static linking.
qt2-Xt:???An X Toolkit add-on for the Qt GUI toolkit.
qtcups:???A CUPS front-end and library for qt that provides a GUI for printer settings.
qtcups-devel:???Development files that enable Qt applications to configure printers.
qt-Xt:???The Xt compatibility add-on for Qt.
serviceconf:???A utility that configures enabled services on the system.
soup:???SOAP implementation in C.
soup-devel:???Development libraries for SOUP SOAP tools.
tripwire:???A system integrity assessment tool.
watanabe-vf:???The Japanese watanabe font.
XFree86-xtrap-clients:???Sample clients for use with XTrap server extensions.
xmms-gnome:???Components used to integrate the Xmms player into GNOME.
xpdf-*:???Support for various languages in xpdf.