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Gecko is developed by the Mozilla Foundation under the project names NGLayout (the renderer) and XPFE (for cross-platform user interfaces). NGLayout was previously called Raptor and originally meant "Next Generation Layout", but has been adopted by Netscape to be "Netscape Gecko Layout".

Gecko offers a rich programming API that makes it suitable for a wide variety of roles in Internet enabled applications, such as web browsers, content presentation and client/server. Primarily it is used for the Mozilla browser derivatives such as Netscape and Mozilla FirefoxMozilla Firefox (originally known as Phoenix and intermittently as Mozilla Firebird is a free web browser developed by the Mozilla Foundation and hundreds of volunteers. Before its 1. 0 release on November 9, 2004, Firefox had already garnered a great dea, but it is used elsewhere as well.

Products that use Gecko for the entire user interface via XULXUL stands for XML-based User-interface Language . It is an application of XML used to describe window layout in the Mozilla browser. It is pronounced zool (to rhyme with "cool"). XUL is not a public standard, although parts of it are creeping into the W3:

• Mozilla (Mozilla.org's own browser suite under the codename SeaMonkey)
• NetscapeNetscape Navigator is a web browser that once dominated the market but now has only a relatively small number of users. Rise Netscape Navigator, also known simply as "Netscape", was the flagship product of the Netscape Communications Corporation. The comp 6.0 and later versions
• Beonex CommunicatorBeonex Communicator is a web-browser and email/news client based on Mozilla. Beonex Communicator is targeted at individuals and corporate end-users, for the Windows, Linux, Mac OS, and FreeBSD platforms. Beonex Communicator belongs to the Mozilla family o
• IBM Web Browser for OS/2OS/2 is an operating system created by Microsoft and IBM and later developed by IBM exclusively. The name stands for "Operating System/2", because it was intended as the preferred operating system for IBM's " Personal System/2 ( PS/2)" line of second-gene
• Aphrodite
• Mozilla FirefoxMozilla Firefox (originally known as Phoenix and intermittently as Mozilla Firebird is a free web browser developed by the Mozilla Foundation and hundreds of volunteers. Before its 1. 0 release on November 9, 2004, Firefox had already garnered a great dea
• ActiveState Komodo visual development environment for Perl, Python and more on Windows and Linux
• ManyOne

Products that use Gecko for rendering HTML and XML content:

• Galeon for GNU/Linux
• Skipstone for GNU/Linux
• K-Meleon for Windows
• Q.BATi for Mac OS X
• Camino for Mac OS X
• CompuServe 7.0 for Windows and Mac OS X
• AOL for Mac OS X
• Salamander for GNU/Linux
• Epiphany for GNU/Linux
• Kazehakase for GNU/Linux - GTK2 (w/o Gnome)
• Mozilla ActiveX Control
• Liferea for GNU/Linux