LeoCAD - LeoCAD is a CAD program for creating virtual LEGO models.
Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
LDraw - LDraw is an open standard for LEGO CAD programs that allow the user to create virtual LEGO models...
LDCad - LDCad is a multiplatform ...
Godot Engine - Feature-packed 2D and 3D open source game engine.
Stud.io - Build LEGO designs online with friends.