Sonatype GWT REST is a "generic" (low-level) fully-compliant (real) REST async client for GWT that avoids "native" GWT RPC completely. It adds "generic" capability to drive any JSON, XML, or plain text-enabled REST Service from GWT client applications. Sonatype Nexus is powered by the restlet.org REST Framework, so this client is usable with all REST services which are backed by the restlet.org Java framework or implement real REST.
Nexus is a powerful and robust Maven repository manager created to provide reliable access to artifacts required for development and provisioning. Maven's central repository has always served as a great convenience for users of Maven, but it has always been recommended to maintain your own repositories to ensure stability within your organization. Nexus greatly simplifies the maintenance of your own internal repositories and access to external repositories. You can completely control access to, and deployment of, every artifact in your organization from a single location.