Ace - Code Editor in JavaScript

Ace is a standalone code editor written in Javascript. Ace is developed as the primary editor for Cloud9 IDE and the successor of the Mozilla Skywriter project. It could provide Syntax highlighting, Auto indentation, key bindings including VI and Emacs modes, Themes, Search and replace and lot more.

It supports syntax highlighting for Javascript, HTML, CSS, XML, Python, PHP, Java, Ruby, C++, CoffeeScript.
Source code location: https://github.com/ajaxorg/ace