Ultimate++

The major Ultimate++ features are:

• Supports Unix/Linux/FreeBSD (X11), Microsoft Windows and macOS.
• Includes an IDE and a GUI designer.
• Uses heavily RAII and auto pointers-like mechanisms to avoid manual memory management and even to limit the use of pointers in the code [7]
• Can emulate[8] native widgets look and feel. On X11 systems, Ultimate++ supports GTK+ widgets look and feel.
• Standard distribution comes with Ultimate++ sources included, even the IDE ones.
• Uses NTL as template system instead of STL.

The following example creates a C++ application with "Hello world!" button:

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

class MyApp : public TopWindow 
{
public:
    MyApp() 
    {
        Title("Hello world");
        button.SetLabel("Hello world!");
        button << [=] {
            if (PromptYesNo("Button was clicked. Do you want to quit?"))
                Break();
        };
        Add(button.HSizePos(100, 100).VSizePos(100, 100));
    }
    
private:
    Button button;
};

GUI_APP_MAIN
{
    MyApp().Run();
}

Example applications using Ultimate++ are:

• Openwind[9] - an open-source wind farm design software
• UppCAD[10] - a multipurpose CAD system[11]

• Widget toolkit
• List of widget toolkits
• Qt (toolkit) - toolkit used by KDE applications
• GTK+ - the GIMP toolkit, a widget toolkit used by GNOME applications
• FLTK - a light, cross platform, non-native widget toolkit
• FOX toolkit - a fast, open source, cross-platform widget toolkit
• wxWidgets - a widget toolkit and tools library for creating graphical user interfaces

• Official website