The fastest, easiest way to get started creating apps for Office and SharePoint is to sign up for an Office 365 Developer subscription. This customized Office 365 subscription includes all the tools and resources you need to start building and testing apps right now:

An Office 365 Developer Site, customized for creating and testing apps that work with SharePoint Online, Office Online, Exchange Online, and more

"Napa" Office 365 Development Tools, to create your first apps right within the browser

Office Professional Plus 2013

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