What projects have a similar aim to the libcloud project, and how mature are they?

Question

libcloud is a standard client library for many popular cloud providers, written in python: http://incubator.apache.org/libcloud/

Answer 1

http://code.google.com/p/jclouds/ for java.

Attended a talk by the author nice Guy and was an interesting talk. I have not used it myself yet.

Paul