The Zettar ZCloud Virtual Applicance (ZCloud) is a sandbox for Amazon S3. It currently runs under three popular virtualization platforms: Linux KVM, Xen, and VMWare Server, 32bit or 64bit. More to come soon. The host computer may run any operating system that runs one of these supported virtualization platforms. It implements Amazon S3 REST API, the de-facto Cloud Storage REST API standard, and is easy-to-use, fast, reliable, and scalable. ZCloud allows your company to meet the needs of developing new cloud applications with faster speed, less effort, and minimized development cost right away.