ThoughtSource Property Server
ThoughtSource Property Server allows you to store and manage application configuration properties in a centralized location. Applications fetch properties from a RESTful service through agents, which provide seamless integration from Java and Spring applications.
You can integrate easily from Java apps using the built-in java.util.Properties extension or using the built-in Spring PropertyPlaceholderConfigurer extension. Integrate from apps written in other languages using the REST API.
...And, it's FREE for Dev, Test and Prod.
See http://www.ThoughtSource.com for more info.