Atom.jar is a project mainly written in Java, it's free.
Java classes for GData/Atom on client and server.
atom.jar
Java-classes for GData/Atom on client and server.
You can download the installable atom.jar from /stage/atom.jar. It depends on the two JARs in lib/: gdata-core-1.0.jar and log4j-boot.jar.
You can get the javadoc from stage/atom_javadoc.zip.