julianshapiro/velocity

Velocity is a JavaScript library for creating animations on web pages. It solves the problem of making animations smooth and fast without relying on the slow, limited animation tool that jQuery (a popular JavaScript helper library) provides. If you have ever seen a button that slides in, a panel that fades, or text that zooms into place on a website, that kind of effect is what Velocity handles. The library is written in JavaScript (with a TypeScript rewrite in version 2.0), runs in the browser, and works as a standalone tool, you do not need jQuery to use it, though it can hook into jQuery or Zepto if those are already in your project. You install it via npm (a package manager for JavaScript developers) or load it directly from a content delivery network (CDN, a service that hosts files for fast global delivery). One of its key features is chaining: you can queue multiple animations so they play one after another with a single line of code. An optional UI pack adds a set of pre-built animation effects. A plugin for use with the React user-interface framework also exists as a separate project. The README notes that companies including WhatsApp, Tumblr, and Uber have used Velocity in their products. The project is MIT-licensed, meaning it is free to use in commercial and personal projects.