Qt4based

Qt4based is a term that can refer to software applications or components that are built using the Qt 4 framework. Qt 4 is a cross-platform application development framework that provides a set of C++ libraries and tools for creating graphical user interfaces (GUIs) and non-GUI applications. It was widely adopted for its extensive features, ease of use, and ability to deploy applications on various operating systems such as Windows, macOS, Linux, and embedded devices.

When a software is described as "Qt4based," it signifies that Qt 4 was the primary toolkit or set of libraries used in its development. This implies that the application likely benefits from Qt 4's features, including its event-driven programming model, rich widget set, database access capabilities, networking functionalities, and multimedia support. Developers choosing Qt 4 often did so to streamline development across multiple platforms, leveraging a single codebase for different operating systems.

The Qt 4 framework was released by Trolltech (later acquired by Nokia, and now developed by The Qt Company) and has seen several major versions. While Qt 4 is an older version, many legacy applications and systems continue to be maintained or are still in active use, hence the continued relevance of the term "Qt4based." Newer projects typically utilize more recent versions of the Qt framework, such as Qt 5 or Qt 6, which offer enhanced features, performance improvements, and modern development paradigms. Therefore, identifying a system as "Qt4based" often indicates it belongs to an earlier generation of Qt-powered software.