What is gtk?

Gtk

GTK+ (GIMP Toolkit) is a cross-platform widget toolkit for creating graphical user interfaces. It is licensed under the terms of the GNU LGPL, allowing both free and proprietary software to use it. It is one of the most popular toolkits for the X Window System, along with Qt.

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Some articles on gtk:

Moonlight (runtime) - Desktop Support
... Moonlight was also usable outside of the browser as a Gtk+ widget (known as Moonlight.Gtk) ... set of helper classes built on top of Moonlight.Gtk that can be used to create full blown C# desktop applications using the Moonlight (Silverlight 4.0) widgets ...
Gtk - Uses - Applications
... Some notable applications that use GTK+ as a widget toolkit include AbiWord – Word processor Anjuta – Integrated development environment (IDE) Ardour – Digital ...
Audacious (software) - History
... both the Winamp-like interface known from previous versions and a new, GTK+-based interface known as GTKUI, which resembles foobar2000 to some extent ... Prior to version 3.0, Audacious used the GTK+ 2.x toolkit by default ... Partial support for GTK+ 3.x was added in version 2.5, while version 3.0 has full support for GTK+ 3.x and uses it by default ...
GTK (disambiguation) - See Also
... All pages beginning with "GTK" All pages beginning with "Gtk" All pages with titles containing "GTK" (includes gtk) ...
GTK (disambiguation)
... GTK+, or The GIMP Toolkit, is a cross-platform widget toolkit for creating graphical user interfaces ... GTK may also refer to GTK (TV show), Australian TV series GTK (API), an application programming interface used in the 1980s Gtk# or Gtk sharp, set of.NET bindings ...