Godot Engine - Feature-packed 2D and 3D open source game engine.
BYOND - BYOND is the premier community for making and playing online multiplayer games.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Defold Engine - Defold lets you quickly build high performing, cross-platform games together with your team.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.