I was complaining in a post from January that Google Pack could be a very cool package if it had an API that allows it to check a wide variety of software for updates. Google Pack only includes Google's software and a small list of other free applications like Firefox, Adobe Reader, RealPlayer.
Filehippo, one of the best sites where you can download high-quality software, launched Update Checker, a small utility that scans your computer for installed software and displays a list of updates. While the software doesn't require installation, it doesn't check for updates periodically and must be manually launched. Another inconvenient is that you have to manually download and install the updates.
The software is in beta, so it wouldn't surprise if it adds these features in the next versions.