Is there a good in-browser code editor? [closed]

Question

CodeMirror comes with support for 60+ languages, and addons that implement more advanced editing functionality (autocompletion, code folding, configurable key bindings, search & replace, linter integration etc.). A rich programming API and a CSS theming system are available for customizing CodeMirror, and extending it with new functionality.

It has been developed since early 2007, has a Wikipedia page, and is being used in a wide number of popular open source projects (Joomla, Firebug etc.).

Ace. They don't use an iFrame.

The editArea javascript library does a pretty good job. It's used by the OpenCMS content management system as it's in-place JSP and JavaScript editor. The colorization gets a bit confused when the file is > 2000 lines or so.

The feature list from their page is:

• Easy to integrate, only one script include and one function call
• Tab support (allow to write well formated source code)
• Search and replace (with regexp)
• Customizable real-time syntax highlighting (currently: PHP, CSS, Javascript, Python, HTML, XML, VB, C, CPP, SQL, Pascal, Basic, Brainf*ck)
• Auto-indenting new lines
• Line numbering
• Multilanguage support (currently: Croatian, Danish, English, French, German, Italian, Japanese, Polish, Portuguese)
• Full screen mode
• Can work in the same environment than "protype" and "mootools"'s like libraries.

Mozilla's Bespin looked very interesting, but the project was discontinued.