There is a neat update checker at Filehippo. It’s still in beta but works fine.
It will find updates for programs that Filehippo has. So it’s not going to catch updates for everything. But it does catch updates for many of the common downloadable programs.
Very handy for keeping up to date on some of the common Windows programs.
I still remember back when c|net (now download.com) had the CatchUP utility that did the same thing. Unfortunately it was short lived and was discontinued several years ago.