Tableau - Tableau can help anyone see and understand their data. Connect to almost any database, drag and drop to create visualizations, and share with a click.
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.
Kickdrop - Beautifully crafted code snippets
Chart.js - Easy, object oriented client side graphs for designers and developers.
June - Instant analytics reports, built on top of Segment
Google Charts - Interactive charts for browsers and mobile devices.