Locust.io - an open source load testing tool. Define user behaviour with Python code, and swarm your system with millions of simultaneous users.
Note
Matter.js - 2D physics engine for HTML5 mobile and web applications. Has a great demos
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at MobiDev (Kharkiv, Ukraine)
Code in Ruby and Elixir, but still love PHP. Explore ES6 and Vue.js. Explore databases, use Ubuntu and MacOS, think about IT people and management
Notes
Workerman - a library for event-driven programming in PHP. Alternative to ReactPHP.
Trailblazer - a new Concept or a Domain Driven application structure for Rails. Tries to get rid of fat models, monolithic controllers, global helpers, etc.
ramjet - morph DOM elements from one state to another with smooth transitions