Android/iOS: Alongside Windows 8.1, Microsoft released its Remote Desktop application today for both Android and iOS. This makes it easy to control your Windows desktop from your Android or iOS device.
You can access almost everything on your Windows computer directly from your smartphone or tablet. Once you're connected, you can access your computer using the touch interface with full support for Windows gestures. Everything's authenticated as well, so wherever you are your connection will remain secure.
Microsoft Remote Desktop (Free) [Google Play]
Microsoft Remote Desktop (Free) [iTunes App Store]