IDEs

Visual Studio (Free IDE):
https://visualstudio.microsoft.com/

JetBrains (Licensed IDE Suite):
https://www.jetbrains.com/

SHADERed (Opensource Shader IDE):
https://shaderd.org/
https://github.com/dfranx/SHADERed

Game Engines

Unreal Engine (Free under $1M revenue):
https://www.unrealengine.com/en-US

Unity (Free under $100k revenue):
https://unity.com/

GODOT (Opensource game engine)
https://godotengine.org/
https://github.com/godotengine/godot