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A mobile software development start-up thinks it has found a way to the mobile industry's holy grail: an open-source method for writing an application once and running it anywhere.

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Rhomobile is ready to release Rhodes 1.0, a framework designed for application developers who want to reach more than one mobile computing operating system--such as Apple's iPhone OS X, Microsoft's Windows Mobile, or Research In Motion's BlackBerry--without having to spend the time and money required to develop separate applications for each operating system. Rhodes allows developers to code their applications in HTML and Ruby and have that code natively execute on the phone of their choice.

Rhodes is basically a lightweight implementation of the popular Ruby on Rails framework used to build modern Web applications, said Adam Blum, CEO of Rhomobile. Rhomobile created a number of components that do the heavy lifting for getting the HTML and Rudy code to run on the various operating systems supported, which include Android, BlackBerry OS, iPhone OS X, Symbian, and Windows Mobile devices.

Developers who want to achieve this now can build Web-based applications, but Blum said Rhodes-developed applications run natively on the phone, which allows developers to build more sophisticated applications that can also use specific parts of the phone such as its camera or sensors. The framework uses the embedded browser components in the various platforms to make sure the applications conform to user-interface guidelines, and Blum said applications designed this way have passed muster with Apple's notoriously fickle App Store approvers.the national society of high school scholars