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I'm writing a paper and trying to determine the advantages between plugin frameworks like flex/flash and silverlight versus javascript frameworks. &nbsp;I can't find any good articles explaining why one would choose one over the other. &nbsp;Any help? &nbsp;Can developers created content for flex and silverlight without buying anything as with a framework like Yahoo UI?
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I'm writing a paper and trying to determine the advantages between plugin frameworks like flex/flash and silverlight versus javascript frameworks.  I can't find any good articles explaining why one would choose one over the other.  Any help?  Can developers created content for flex and silverlight without buying anything as with a framework like Yahoo UI?

Why would someone use javascript frameworks over flex/flash/silverlight?

Most development for the Microsoft platform is done utilizing the technologies supported by the.NET framework. Other development is done using Visual Basic for Applications (VBA) for programs like Access, Excel, Word and Outlook, with PowerShell for scripting, or with SQL for large databases.

Microsoft Development

Apache Flex is a highly productive, open source application framework for building and maintaining expressive web applications that deploy consistently on all major browsers, desktops and devices (including smartphones, tablets and television). It provides a modern, standards-based language and programming model that supports common design patterns suitable for developers from many backgrounds. Flex applications can be deployed to the Adobe Player in the browser, Adobe AIR on desktop and mobile devices or to native Android, iOS, Windows or Mac applications.

Apache Flex

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.