wxWidgets (wix-widgets, formerly wxWindows) is a widget toolkit and tools library for creating graphical user interfaces (GUIs) for cross-platform applications.
License: Open Source
wxWidgets and GTK+ are both powerful GUI toolkits, with wxWidgets offering a more native look across platforms and a broader programming language support, while GTK+ provides a modern widget set and is deeply integrated with the GNOME desktop environment. GTK+ may be more resource-intensive and less cross-platform friendly, whereas wxWidgets is preferred for applications needing a lightweight solution with native performance.