dhtmlxPivot

It's a JavaScript Pivot table library for building powerful pivot grids that will help you to work with complex data. By using dhtmlxPivot, you'll be able to summarize large datasets and visualize them in a convenient way.

Main features:

• intuitive drag-n-drop interface
• high performance
• easy configuration and customization of layout
• simple localization to any language you need
• data loading in the JSON format