The Windows Software Development Kit for Windows 8.1 contains headers, libraries, and tools you can use when you create apps that run on Windows operating systems. You can use the Windows SDK to write Windows Store apps and desktop apps for Windows 8.1.

Get the tools that you need to develop apps and games for Windows Phone.

Visual Studio Express 2013 for Windows provides the core tools that are required to build compelling, innovative Windows Store apps.

The Kinect for Windows Software Development Kit (SDK) enables developers to create applications that support gesture and voice recognition, using Kinect sensor technology on computers running Windows 7, Windows 8, Windows 8.1, and Windows Embedded Standard 7.

Get the Microsoft Azure SDK, .NET client libraries, and Visual Studio Tools for Microsoft Azure—everything you need for cloud development in an all-in-one installable package.

Use Mobile Services to enable client applications, including Windows Store and Windows Phone apps, to connect to a scalable and secure backend hosted in Microsoft Azure.

Use Media Services to build scalable media management and delivery applications. Get started by downloading the Media Services SDK and player frameworks for popular platforms.

The SharePoint 2013 Client Components SDK can be used to enable remote and local development with SharePoint Server 2013. 

The Microsoft Project 2013 software development kit contains documentation, code samples, "How to" articles, and programming references to help customize and integrate the Project 2013 clients and Project Server 2013 with other applications for enterprise project management.

The Microsoft Vidio 2013 SDK contains the latest documentation, samples, header files, libraries and tools that you need to develop custom solutions for Visio 2013.

This SDK installs SharePoint client libraries and templates for Windows Phone 8.