Webhook.site - Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.
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.
Hookdeck - Hookdeck makes it simple to build and deploy reliable, testable, and debuggable applications that rely on webhooks.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Beau - No-code platform to build, automate customers' workflows, step-by-step
Google Charts - Interactive charts for browsers and mobile devices.