Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
BYOND - BYOND is the premier community for making and playing online multiplayer games.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Defold Engine - Defold lets you quickly build high performing, cross-platform games together with your team.
Unity - The multiplatform game creation tools for everyone.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.