Lovelycharts.com is free online service that allows you to easily create different kinds of diagrams, flowcharts, sitemaps etc online right from your web browser, means you can do it on cloud without having to download any app locally in your system. Its 100% free of cost.
Now its very easy to insert a Google Visualization chart inside your WordPress blog posts and pages simply by clicking a button and typing values in WordPress TinyMCE visual editor.
With new WordPress Charts plugin you can create amazing HTML5 charts in your WordPress site. WordPress Charts is an easy, flexible, lightweight shortcode based chart plugin that includes 6 customizable chart types: line, bar, pie, radar, polar area and doughnut types. you can visualise your chart data in various styles and each of them animated and fully customisable, retina supported looks.