An application software (app or application for short) is a computer software designed to perform a group of coordinated functions, tasks, or activities for the benefit of the user.
In computing, a full-screen writing program or distraction-free editor is a text editor that occupies the full display with the purpose of isolating the writer from the operating system (OS) and other applications.
The GNU General Public License (GNU GPL or GPL) is a widely used free software license, which guarantees end users the freedom to run, study, share and modify the software.
GTK+ (formerly GIMP Toolkit) is a cross-platform widget toolkit for creating graphical user interfaces.
In computing, a keyboard shortcut is a series of one or several keys, such as Ctrl+F to search a character string.
An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.
A text editor is a type of computer program that edits plain text.
A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification.
A widget toolkit, widget library, GUI toolkit, or UX library is a library or a collection of libraries containing a set of graphical control elements (called widgets) used to construct the graphical user interface (GUI) of programs.