Axiis : Data Visualization Framework

Axiis is an open source data visualization framework designed for beginner and expert developers alike.
Whether you are building elegant charts for executive briefings or exploring the boundaries of advanced data visualization research, Axiis has something for you.

Axiis provides both pre-built visualization components as well as abstract layout patterns and rendering classes that allow you to create your own unique visualizations.
(Link: Axiis : Data Visualization Framework)