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.