markItUp! is a JavaScript plugin built on jQuery which can turn any textarea into fake "rich" markup editor for Textile, Markdown, BBcode, MediaWiki, Html, etc -- with built in AJAX preview...
Mapeed.AddressChooser is a Javascript script to create a nice address form for any websites that need to collect addresses. For example getting user's address, place's location or anything that can be localized on a map. This script just add behavior on HTML form, it does'nt geerate HTML markup and can be plugged on any existing forms.
« CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. »
DirtyMarkup combines the power of HTML Tidy, CSS Tidy, JS Beautify, and the Ace editor to effortlessly clean up your messy code. Just paste your code into the editor and press "clean". Now supports HTML5!