Top 20 NuGet universalapps Packages

Helpers for WinRT applications
manage multiple screens in your Windows 8.1 application
Control for showing page flyout on Windows Phone. Usefull for implementing searchbox, custom menus, etc
wrapper and helpers around background downloads and uploads for WinRT apps
JSON data management cross-platform
Interface to handle logging work
Enables JavaScript Intellisense for the Bing Maps v7.0 Ajax Map Control in Visual Studio.
Wrapper library to make creating and working with SQLite database files from applications easier