FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Unity - The multiplatform game creation tools for everyone.
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.
Godot Engine - Feature-packed 2D and 3D open source game engine.
GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.