The Xen Node.js Library by Pirlot Nicolas provides a module to interact with Citrix XenServer API, and is designed to let users make XML-RPC calls with Xen's API. The Xen API, or XAPI, gives developers tools and an interface for the remote management of virtualized guests running on a Xen-enabled host.
Most of our 5800+ Mashups listed in our directory involve a new site being created from one or more other services, usually web sites themselves. The Kynetx API, which has been called Greasemonkey in the cloud, brings mashups into your browser, right where you're already browsing. The new version of its Chrome extension (coming soon to other browsers) gives users insight into what's creating the mashup they're viewing.