Google-charts-for-wordpress is a project mainly written in PHP and JAVASCRIPT, it's free.
Google Charts for WordPress - a custom post type with a shortcode for chart inclusion in ordinary posts and pages.
h1. Google Charts for WordPress
h2. Supported Chart Types
h2. Shortcode
Shortcode to include a chart in a post or a page:
[googlechart id="123" width="400" height="300"]