Fancy building apps for the newest versions of Office? Microsoft has updated its Office Developer Tools suite for Visual Studio 2012.
The Visual Studio extensions have been available in preview form for a while, but the new release adds extra features, including support for Azure-based apps and better workflow systems. While the download itself is free, you'll need a Office 365 developer subscription to sell apps via the Office Store. That comes free for 12 months if you're a Visual Studio Premium or Ultimate subscriber with MSDN.
Now Available: Office Developer Tools for Visual Studio 2012 [Somasegar's Blog]