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Unity - The multiplatform game creation tools for everyone.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FLTK - Fast Light Toolkit - Fast Light Toolkit (FLTK)