Creating Funnel Charts Using SVG and D3.js – D3 Funnel
D3 Funnel is a JavaScript library for drawing customizable SVG based funnel charts using D3.js library.
JavaScript & CSS Funnel Chart
Beautiful SVG Funnel Chart JavaScript Library – FunnelGraph.js
The FunnelGraph.js JavaScript library helps you dynamically draws a beautiful, customizable, SVG-based, horizontal/vertical funnel chart to represent stages in a process.