Web Directory

» Gecko
   Maintained and primarily used by the Mozilla Corporation on Firefox, Nvu and Thunderbird. [Open-Source, Mozilla tri-license]
   https://developer.mozilla.org/en/Gecko

» GtkHTML
   Designed to be implemented into GTK applications requiring lightweight HTML functionality. [GPL]
   http://directory.fsf.org/project/gtkhtml/

» KHTML
   Rendering engine maintained by the KDE project and used in Konqueror. [GNU]
   http://www.konqueror.org/features/browser.php

» Opera Presto
   Proprietary rendering engine maintained by Opera Software. Used by the Opera Browser.
   http://dev.opera.com/articles/view/presto-2-1-web-standards-supported-by/

» Trident
   Rendering engine used on the Windows versions of Internet Explorer. Also known as MSHTML.
   http://msdn.microsoft.com/en-us/library/aa741317.aspx

» WebKit
   Originally derived by Apple from the KHTML software library of Konqueror. Primarily used by Safari and Google Chrome. [Open-Source, LGPLv2/BSD-style]
   http://webkit.org/