Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
LeoCAD - LeoCAD is a CAD program for creating virtual LEGO models.
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.
LDCad - LDCad is a multiplatform ...
SR 3D Builder - SR3DBuilder is an advanced CAD to create and ANIMATE LEGO models on your PC. Features: