WebStorm

WebStorm is an excellent JavaScript IDE (Integrated Development Environment) that features a built-in HTML editor and a really advanced autocompletion function. It is also capable of handling language injections, such as HTML or SQL code inside a JavaScript. WebStorm supports HTML5 and Node.js, provides Zen Coding and JavaScript Debugging capabilities, and can be integrated with Subversion, Git, GitHub, Perforce, Mercurial, and others.

WebStorm is a very complete JavaScript IDE, it offers auto-completion for keywords, variables, labels, parameters and functions, both standard and user-defined. Its JavaScript refactoring capabilities allow you to easily modify your code and also undo any modifications. You can also test and debug your code, and what is more, it even checks your code for common mistakes on the fly. These and many more features make of WebStorm a very versatile IDE that will considerably increase your productivity.