OpenStack4j is an OpenStack client which allows provisioning and control of an OpenStack system. This includes support for Identity, Compute, Image, Block Storage, and Network using Java. The library supports the following OpenStack services: Identity (Keystone), Compute (Nova), Network (Neutron), Image (Glance), and Block Storage (Cinder).
Apilator is a high-performance, self-contained clustered server for building data APIs over HTTP. Its components and algorithms have been carefully selected for high performance, and it is especially suitable for systems with a large number of low-activity clients, such as mobile or Web-based applications. It does not need an external application server, and features automated session cookies, automatically synchronised session storage across multiple instances, and unique dynamically adjusted session storage that gives you the flexibility to add or remove servers from the cluster without configuration or restarting.