To develop apps for Microsoft - PYF 2014 Windows 8.1 Hackathon you need following tools
To develop application for Windows 8.1, you need following tools,
Windows 8.1 (90 Day trial)
Visual Studio 2013
Windows Azure SDK 2.2
Microsoft SQL Server Data Tools
For further details or to get tools personally you can visit Microsoft Innovation Center - Lahore at Office # 501, ASTP Lahore.