New to CentOS, I want to install common utilities, e.g., graphics (kolourpaint), security (truecrypt), usenet (pan), DVD creation (DeVeDe), DVD burning (brasero), etc.
But, I'm stumped at the very simplest of steps (I think):
Q: What is the search engine that tells me which repository {kolourpaint,truecrypt,pan,devede,brasero,etc.} resides in?

I first search this CentOS forum for, say, "install kolourpaint" but it fails to bring up a single thread or post for the entire forum.
Likewise, searches such as "truecrypt" don't bring up a single installation (just a few usage questions).
Similarly with "brasero", "pan", and "devede".
Then, as per Centos installing software, I try (all to no avail):


I then try to find the missing repositories as per Available Repositories for CentOS but a search there finds nothing for these software packages.


And, lastly I simply google the net, and of course I find RPMs for, say, kolourpaint:
http://pkgs.org/centos-5-rhel-5/repoforge-x86_64/kolourpaint-1.2.2-2.el5.rf.x86_64.rpm.html

But, before I install that using the rpm command, I really should try to find a CentOS-blessed repository (right?):


In summary, I 'think' my noob problem is that I don't (yet) know the simplest basics on two things:
a) How to search for a repository that actually contains the desired tool
b) How to 'add' that repository such that yum (or rpm) can install that desired tool

Before I try to figure out how to configure RPMForge and ATrpms as per centos.org repositories or how to compile from source ...

May I ask:
Q: What is the search engine that tells me which repository {kolourpaint,truecrypt,pan,devede,brasero,etc.} resides in?