VersionEye supports reference badges for open source projects now! A reference badge shows how many other projects depend on a selected software package. This here for example is the reference badge for PHPUnit.
It shows immediately that 7704 PHP projects are using PHPUnit. Awesome! Right?
The conclusion is that as more references a project has as more important it is. VersionEyes reference badge can be integrated into Markdown and HTML. For example into a GitHub Readme page. In that way everybody can immediately see the relevance of the project. Read more about it here.
Robert Reiz 