Here’s a blog post with a nice list of PHP Tools:
I’m especially interested in Phing, a project build system, which I’ll be using for an application I’ll be building in partnership with another company.
Here’s a bit summary from his blog on Phing:
The idea behind phing (and other build tools) is to evaluate a set of dependencies, then execute a set of PHP classes to properly install and configure an application. The build process is controlled by a simple XML configuration file. Out of the box, phing can perform token replacement (e.g., to change include paths on your development and production systems), execute SQL, move and copy files, run shell scripts, and more. You can also create your own custom tasks by extending the â€œtaskâ€ class included with the package.