Getting a list of available packages using yum
These yum commands can be used to get a list of packages that are available
for download from whatever repositories you've get setup in /etc/yum.conf.
yum info available | less
is probably more than you want to read.
yum list available is the short version
You can narrow it down with:
yum info package(s)
or search for names containing a string
yum search name