Pygments is a syntax highlighting engine written in Python. That means, it will take source code (or other markup) in a supported language and output a processed version (in different formats) containing syntax highlighting markup.
This Wikipedia and Google Code Converter and Code Highlighter form can convert your:
* HTML snippets into:
o Wikipedia wikitext format.
o Google Code wikitext format.
* programming sources into syntax highligthed HTML text.
A lint tool performs static analysis of source code and flags patterns that might be errors or otherwise cause problems for the developer.
CSS Lint points out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problematic patterns or signs of inefficiency. The [rules] are all pluggable, so you can easily write your own or omit ones you don't want.
Cloud9 is a state-of-the-art IDE that runs in your browser and lives in the cloud, allowing you to run, debug and deploy applications from anywhere, anytime.
Supports several languages with Javascript and HTML/CSS currently being the core ones. We also support Coffeescript, Ruby, PHP and many others with syntax highlighting with more to follow.
9ne (pronounced "nine") is an online code editor based on Emacs (Copyright 2006 Rob Rohan). 9ne is a recursive acronym and joke, and means "9ne is not Emacs".
9ne's design goal is to provide an all purpose text editor similar to Emacs but web based. The first step is to assist in code editing (specifically HTML, CSS, and Javascript), but to also add hooks for any type of editing (mail reader, configuration files, etc). It currently supports XML and Javascript syntax highlighting modes (Evoked with M+X XML MODE and M+X JAVASCRIPT MODE respectively)
9ne (pronounced "nine") is an online code editor based on Emacs (Copyright 2006 Rob Rohan). 9ne is a recursive acronym and joke, and means "9ne is not Emacs".
9ne's design goal is to provide an all purpose text editor similar to Emacs but web based. The first step is to assist in code editing (specifically HTML, CSS, and Javascript), but to also add hooks for any type of editing (mail reader, configuration files, etc). It currently supports XML and Javascript syntax highlighting modes (Evoked with M+X XML MODE and M+X JAVASCRIPT MODE respectively)
JSLint takes a JavaScript source and scans it. If it finds a problem, it returns a message describing the problem and an approximate location within the source. The problem is not necessarily a syntax error, although it often is. JSLint looks at some style conventions as well as structural problems. It does not prove that your program is correct. It just provides another set of eyes to help spot problems.
ecoder is an open-source web-based code editor, with real-time colour syntax highlighting, which allows multiple documents to be edited directly online at the same time. mecoder made possible thanks to editarea javascript wizardy.requirementsecoder works with most standards compliant browsers which have javascript enabled. internet explorer 6 is not supported.
Rainbow XML editor makes editing XML easy. By clearly visualising your data as a series of nodes, Rainbow allows you to focus on manipulating data rather than having to worry about creating correct XML syntax.
Rainbow is free to use online which means you can load it from any computer at any time - all you need is the latest Flash player. Try it now!
Build-time error reporting, refactoring and code completion in Visual Studio
Extended JavaScript syntax power with C# language features
Pure client-side control library coded in C#
Pandoc is a program for converting between various markup formats. Input formats include markdown, reStructuredText, HTML, and LaTeX; output formats include HTML, LaTeX, ConTeXt, S5, DocBook, groff man, reStructuredText, markdown, and RTF. Many extensions to standard markdown syntax are provided, including inline LaTeX math, tables, definition lists, superscripts and subscripts, smart quotes and dashes, and footnotes
Pandoc is in the MacPorts, Debian, Ubuntu, Slackware, Arch, NetBSD, and FreeBSD ports repositories. Note that the version of pandoc in these repositories may not be the most recent. There is also a Windows installer.
Create mashups using our simple online editor.
The Google Mashup Editor provides simple tools and features that allow you to create mashups in minutes.
A set of tags that compiles into AJAX UI components
Syntax highlighting
Autocomplete of gm tags by pressing the tab button
Quick access to documentation for any tag by pressing F2
File upload and management
Error checking and notification
Feed editor and manager
Group items tagged 
