Construct Classic - Construct Classic is a free, DirectX 9 game creator for Windows, designed for 2D games.
Construct 2 - Scirra Construct is a 2D game development engine with a focus on building games visually.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Godot Engine - Feature-packed 2D and 3D open source game engine.
RPGBoss - Cross-platform 2D role playing game maker.
BYOND - BYOND is the premier community for making and playing online multiplayer games.