Most of the applications existing today for the GNU/Linux OS are written using the GTK and Qt graphical libraries.
For example, desktop environment applications of GNOME (and its derivatives) are written using the GTK framework. GNOME is used in the following popular Linux distributions: Ubuntu, Fedora, Linux Mint, Debian, and others.
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Meanwhile, the KDE Plasma desktop and applications are developed using the Qt graphical library.
A brief excerpt from Wikipedia:
GTK
📝 Note
GTK (short for GIMP ToolKit) is a cross-platform library of interface elements (a framework) with an easy-to-use API, and along with Qt is one of the two most popular libraries today for the X Window System.
Originally part of the GIMP graphics editor, it evolved into a separate project and gained notable popularity. GTK is free software, distributed under the GNU LGPL, which allows creating both free and proprietary software using the library. GTK is the official library for building the graphical interface of the GNU project.
Qt
📝 Note
Qt is a framework for developing cross-platform software in the C++ programming language. Many programming languages have libraries that allow taking advantage of Qt: Python — PyQt, PySide; Ruby — QtRuby; Java — Qt Jambi; PHP — PHP-Qt, and others.
Since its appearance in 1996, the library has formed the basis of many software projects. In addition, Qt is the foundation of the popular KDE working environment, which is included in many Linux distributions.
Links to read:
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