Apache Maven 2
An OSS (Apache) structured build and repository tool in Java.Maven has the potential to bring CPAN-like ease-of-use to Java applications (with the help of Ant Anywhere).
Resources
Maven Home Page
The POM demystified, JavaWorld Article
Maestro is a complete client/server bundle of Maven and a
repository. Mergere provides commercial services to support Maven
use. Maestro info
Other tools
http://java-source.net/open-source/build-systems