RemoteHQ - Real-time collaboration for distributed teams
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.
Diagrams for Mac - A diagram editor for visualizing structures and processes
Chart.js - Easy, object oriented client side graphs for designers and developers.
Stately Viz - Visualize, simulate, and inspect your state machines
Google Charts - Interactive charts for browsers and mobile devices.