Unity - The multiplatform game creation tools for everyone.
LDraw - LDraw is an open standard for LEGO CAD programs that allow the user to create virtual LEGO models...
Godot Engine - Feature-packed 2D and 3D open source game engine.
LeoCAD - LeoCAD is a CAD program for creating virtual LEGO models.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Stud.io - Build LEGO designs online with friends.