Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
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.
memcached - High-performance, distributed memory object caching system
Chart.js - Easy, object oriented client side graphs for designers and developers.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Google Charts - Interactive charts for browsers and mobile devices.