Top 20 NuGet windowsphone Packages

Tab control based on html fragments
search engine to index and search content locally
navigation control in a side flyout
control implementing semantic zoom interface. It's usefull for wrapping custom controls in a SemanticZoom control
Control to display items in a grid way (horizontal or vertical). Supports several layout options
custom Hub Control relying on WinJSContrib navigator control
Control and css framework for handling data forms with validation
Helps manage datasources with grouping and provide a control to wrap listview with grouping and semantic zoom
Latest version is part of InTheHand.Pontoon package. WebAuthenticationBroker for Windows Phone Silverlight 8.x apps. Share more code across platforms. Build Charming apps for Windows Phone!
Control for a sliding effect on swipe. It helps building navigation or custom controls behaving like a flipview.
Adaptive Runtime Platform ARP Windows Phone Implementation.
Adaptive Runtime Platform ARP Windows Phone Implementation.
Control wrap Pivot control of WinJS to provide sliding effect on swipe on Cordova apps.
manage multiple screens in your Windows 8.1 application
wrapper and helpers around background downloads and uploads for WinRT apps
JSON data management cross-platform
PushettaClient it's a library to use Pushetta push notification API from .Net applications
CrossPlatformLibrary.Device is a plug-in for reading platform-independent device information.
CrossPlatformLibrary.Maps is a plug-in for map related concerns. It enables cross-platform map functionality.
CrossPlatformLibrary.Market is a plug-in for accessing platform-independent app market functionality.