- FCKeditor
- Open source HTML text editor to provide rich text editing on web pages, by Frederico Caldeira Knabben.Own description: "FCKeditor - The text editor for Internet" - HTML Tidy
- HTML Validator.Own description: "HTML Tidy Project Page" - W3C Link Checker
 Own description: "W3C Link Checker" - TinyMCE
- Open source Javascript-based HTML text editor to provide rich text editing on web pages, by Moxiecode Systems.Own description: "TinyMCE is a platform independent web based Javascript HTML WYSIWYG editor control released as Open Source under LGPL by Moxiecode Systems AB. It has the ability to convert HTML TEXTAREA fields or other HTML elements to editor instances. TinyMCE is ver..." - HTML Purifier
- Open source HTML filter library written in PHP.Own description: "HTML filter that guards against XSS and ensures standards-compliant output." - Validator-Lite
- Simple HTML Validator.Own description: "Validator-Lite" - PHP Simple HTML DOM Parser
- Open source HTML parser for PHP.Own description: "PHP Simple HTML DOM Parser CSS Selector"
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