GTK

	GTK version 4 (gtk4-widget-factory, a collection of examples that demonstrate many of the GUI widgets)
Original author(s)	Spencer Kimball, Peter Mattis
Developer(s)	The GNOME Project, eXperimental Computing Facility (XCF)
Initial release	April 14, 1998
Stable release	4.14.1 / March 16, 2024
Preview release	4.13.9 / March 2, 2024
Repository	gitlab.gnome.org/GNOME/gtk ;
Written in	C, CSS
Operating system	Linux, Unix-like, macOS, Windows
Type	Widget toolkit
License	LGPLv2.1+
Website	gtk.org

GTK (formerly GIMP ToolKit^[2] and GTK+^[3]) is a free software cross-platform widget toolkit for creating graphical user interfaces (GUIs).^[4] It is licensed under the terms of the GNU Lesser General Public License, allowing both free and proprietary software to use it. It is one of the most popular toolkits for the Wayland and X11 windowing systems.^[5]

The GTK team releases new versions on a regular basis.^[6] GTK 4 and GTK 3 are maintained, while GTK 2 is end-of-life.^[7] GTK1 is independently maintained by the CinePaint project.^[8]

^ "The GTK Open Source Project on Open Hub: Languages Page". www.openhub.net. Archived from the original on March 28, 2019. Retrieved March 28, 2019.
^ "A brief description on how GTK was born". www.gtk.org. Archived from the original on June 9, 2023. Retrieved July 5, 2023.
^ Bassi, Emmanuele (February 6, 2019). "Project rename to "GTK"". mail.gnome.org. GNOME mailinglist. Archived from the original on November 7, 2020. Retrieved February 7, 2019.
^ The GTK+ Team. "GTK+ Features". Archived from the original on May 25, 2019. Retrieved September 8, 2014.
^ "Documentation". www.x.org. Archived from the original on December 21, 2019. Retrieved November 22, 2019.
^ Cite error: The named reference roadmap was invoked but never defined (see the help page).
^ "GTK 4.0 – GTK Development Blog". December 16, 2020. Archived from the original on May 28, 2023. Retrieved October 18, 2021.
^ "Robin Rowe / GTK1 · GitLab". GitLab. Archived from the original on March 9, 2023. Retrieved February 22, 2023.

[1] "The GTK Open Source Project on Open Hub: Languages Page". www.openhub.net. Archived from the original on March 28, 2019. Retrieved March 28, 2019.

[2] "A brief description on how GTK was born". www.gtk.org. Archived from the original on June 9, 2023. Retrieved July 5, 2023.

[:0-3] Bassi, Emmanuele (February 6, 2019). "Project rename to "GTK"". mail.gnome.org. GNOME mailinglist. Archived from the original on November 7, 2020. Retrieved February 7, 2019.

[4] The GTK+ Team. "GTK+ Features". Archived from the original on May 25, 2019. Retrieved September 8, 2014.

[5] "Documentation". www.x.org. Archived from the original on December 21, 2019. Retrieved November 22, 2019.

[roadmap-6] Cite error: The named reference roadmap was invoked but never defined (see the help page).

[7] "GTK 4.0 – GTK Development Blog". December 16, 2020. Archived from the original on May 28, 2023. Retrieved October 18, 2021.

[8] "Robin Rowe / GTK1 · GitLab". GitLab. Archived from the original on March 9, 2023. Retrieved February 22, 2023.

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