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Godot Engine - Feature-packed 2D and 3D open source game engine.
Monkey 2 - An easy to use, cross platform, games oriented programming language
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
GLBasic - A fast to write, and flexible programming language for developing games and apps
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.