Unity - The multiplatform game creation tools for everyone.
Shadertoy - Build shaders, share them, and learn from the best community.
Godot Engine - Feature-packed 2D and 3D open source game engine.
KodeLife - Real-time GPU shader editor, live-code performance tool and graphics prototyping sketchpad.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SHADERed - Lightweight, full-featured desktop tool for creating and testing HLSL and GLSL shaders