Beyond Compare - Beyond Compare allows you to compare files and folders.
Unity - The multiplatform game creation tools for everyone.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.