Godot Engine - Feature-packed 2D and 3D open source game engine.
Unity - The multiplatform game creation tools for everyone.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
LOVE 2D - Hi there! LÖVE is an *awesome* framework you can use to make 2D games in Lua.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Pygame - Pygame is a set of Python modules designed for writing games.