Unity - The multiplatform game creation tools for everyone.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Godot Engine - Feature-packed 2D and 3D open source game engine.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
LightShot - The fastest way to take a customizable screenshot.