MCNEXT 

Helper methods, bindings, and animations

Custom navigator control that adds new event model and page features

navigation control in a side flyout

Control and css framework for handling data forms with validation

Control for managing an extended splash screen in WinRT apps

Control to display items in a grid way (horizontal or vertical). Supports several layout options

Control for showing page flyout on Windows Phone. Usefull for implementing searchbox, custom menus, etc

Helps manage datasources with grouping and provide a control to wrap listview with grouping and semantic zoom

Control for a sliding effect on swipe. It helps building navigation or custom controls behaving like a flipview.

custom Hub Control relying on WinJSContrib navigator control

helpers that simplify background task integration for WinRT apps

Interface to handle logging work

Tab control based on html fragments

manage multiple screens in your Windows 8.1 application

Control to show progress indicator on a page or globally in the application

helpers and bindings for dates

search engine to index and search content locally

Control to provide page-like navigation with FlipView

control implementing semantic zoom interface. It's usefull for wrapping custom controls in a SemanticZoom control

control to manage ListView layouts in your markup instead of code