Developing Web applications to be used within social networks and numerous other cloud-based structures is becoming more and more de rigueur for the entrepreneurial set. Both on the desktop and on the go, Web users in droves seek simple, unique software gadgets through which to access and manipulate data with easy while able to transfer seamlessly from the home to the office to weekend getaway. So there’s really no mystery in the drive for some engineers to construct platforms upon which developers - particularly the small, self-financed class - can create those ever-present, soft devices in a setting that offers both the requisite toolset and perhaps even some market exposure to boot. One software provider Mashable has mentioned in the past is Sprout, which we deemed impressive when its WYSIWYG (what you see is what you get) widget builder arrived on the scene in late January. This week marked the arrival of another market entry in the form of Zembly, a self-described host and creation engine of social applications that is said to facilitate the construction of apps for use on a number of platforms and devices, including Facebook, OpenSocial, Meebo, Apple’s iPhone, Google’s Gadgets engine, and widgets that may be more broadly embedded. Founded in 2007 and backed by Sun Microsystems (it is established on a framework comprised of Solaris, Java, Glassfish, and MySQL and operates via Sun’s Network.com cloud-computing business), with early praise given by Seth Sternberg, founder and CEO of Meebo, and Jon Aizen, co-founder and CTO of Dapper, Zembly appears to be off to an interesting start. Launched as a private beta, the service, while it does offer you the option to create and amend code, is meant to help those unfamiliar with the ins and outs of building widgets from scratch to piece together new items from previously-assembled components. Zembly describes its main role thusly: “The whole point of zembly is to reuse and combine not just what other people at Zembly create, but to rely on the APIs and data from anywhere on the Web.†So far, Zembly lists about ten or so API participants, including Del.icio.us, Amazon AWS, Flickr, Google, Twitter, Yahoo (NASDAQ:YHOO) , YouTube, Zillow, and Zvents, among others, and invites any other Web API provider to join its list of partners to help broaden the possibilities for new applications through its engine. Of course, there’s only so much reach Zembly can have with its private beta restriction, but it is likely that with time, as Zembly establishes a more solid grip on the booming Web app and widget market, its influence will expand in kind. Zembly has offered Mashable 100 invites. Just enter your email address in the widget linked here to get early access to the service. [ABSTRACT FROM PUBLISHER]