Official online RPM package browser / search for CentOS

Solution 1:

Per my comment, I don't believe there is an equivalent to the "packages.debian.org" central package archive (with web interface) in CentOS.

It's something I think is really missing!

Solution 2:

https://pkgs.org/ provides a "Linux Packages Search" for several distributions, including CentOS 5–7.

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Solution 3:

People are working on one for CentOS. it is called Pandora. Currently, the best bet is to use a GUI based package manager running on CentOS itself in an X windows system (called yumex).

Update: http://rpm.pbone.net though cumbersome, allows searching the RPMs of various redhat-based distros