The internet today truly has everything, with a large number of JavaScript project development tools flooding the web. We can refer to online guides to obtain all kinds of necessary information for building code projects. If you are into web development, you most likely prefer JavaScript, which supports front-end development. This scripting language is relatively easy to use and can create interesting user interfaces for websites and web applications. Below are the 10 best JavaScript libraries available for web project development.
1. IO.js:
IO.js is a JavaScript platform powered by the Chrome V8 runtime. The project is based on the Node.js platform, and IO.js is highly compatible. The platform provides an open governance model, which promises to accelerate and make release cycles more predictable. Moreover, the platform can bring the latest language, API, and performance improvements to the V8 engine while updating libuv and other libraries.

Official website: https://github.com/iojs/io.js
2. Intercooler.js:
This is a natural extension of HTML. Most developers are familiar with HTML platforms with simple attributes, and using Intercooler.js makes development easier. The platform uses JavaScript to communicate with the server and uses the same syntax to send AJAX requests to applications.

Official website: http://intercoolerjs.org/
3. Matter.js:
This is a JavaScript 2D rigid-body physics engine website. The engine modules use different methods to create and manipulate the engine. Matter.js is a controller used to manage updates and render simulations. The project is currently in its early stages, and the Matter.js API is still under development.

Official website: https://github.com/liabru/matter-js
4. Immutable.js:
Immutable.js provides persistent immutable List, Stack, Map, OrderedMap, Set, OrderedSet, and Record functionality. The platform operates efficiently even on modern JavaScript virtual machines. You can copy and cache data through hash maps and vectors used by Clojure and Scala. The platform also provides a lazy Seq feature.

Official website: https://github.com/facebook/immutable-js
5. Format.js:
FormatJS is a modern collection of JavaScript libraries that supports internationalization for number, date, and string formatting. The platform includes a set of core libraries that can be used to build JavaScript internationalization built-in plugins and industry-recognized internationalization standards. FormatJS already has an integrated suite of common templates and libraries.

Official website: http://formatjs.io/github/
6. Anima.js:
Anima.js allows you to use lazy loading and sustained animations. So you can use this platform for CSS animation creation. The tool uses JavaScript to handle CSS transitions and 3D transforms in order to create animations. You can control the tool through processes — starting, stopping, and removing animations, or even creating anything based on events.

Official website: https://github.com/lvivski/anima
7. Is.js:
Is.js is a standalone general-purpose validation library. With Is.js, you can check types, regular expressions, existence, time, and many other things.

Official website: https://github.com/scottrabin/is-js
8. MinBlock.js:
The minBlock.js JavaScript library can be used for implementing a matrix grid. This platform can generate random avatars similar to those on GitHub.

Official website: http://argunner.github.io/minBlock.js/
9. blinkTitle.js:
blinkTitle.js is a pure JavaScript implementation of title bar warnings or notifications. This tool can be used to perform flashing HTML title bar warnings or title bar notifications.

Official website: http://argunner.github.io/blinkTitle.js/
10. Conditioner.js:
If your web application needs loading and unloading behavior, this tool is definitely the best. Conditioner.js makes implementing environment-based behavior very easy — just define the required states and leave the rest to the tool.

Official website: https://github.com/rikschennink/conditioner
These are the top 10 JavaScript libraries for web development in 2015. You might as well give them a try.
Source: http://www.topthink.com/topic/9636.html