Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Unity - The multiplatform game creation tools for everyone.
Shiva Engine - Shiva Engine is a cross-platform development solution.
BYOND - BYOND is the premier community for making and playing online multiplayer games.
AndEngine - AndEngine is a free android 2D OpenGL game engine.