LEGO Digital Designer - LEGO Digital Designer, or LDD, is a free computer program produced by the LEGO Group.
LeoCAD - LeoCAD is a CAD program for creating virtual LEGO models.
LDCad - LDCad is a multiplatform ...
Stud.io - Build LEGO designs online with friends.
Mecabricks.com - Mecabricks is an online LEGO building tool.
SR 3D Builder - SR3DBuilder is an advanced CAD to create and ANIMATE LEGO models on your PC. Features: