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D3.js - D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Website Grader - Grade your website's strengths and weaknesses in seconds.
Google Charts - Interactive charts for browsers and mobile devices.
Smaller - Make your websites load faster