LEGO MINDSTORMS EV3 - In the event that you are a LEGO aficionado and one of your distractions incorporate robots, you most likely found out about LEGO robots.
LDraw - LDraw is an open standard for LEGO CAD programs that allow the user to create virtual LEGO models...
LDCad - LDCad is a multiplatform ...
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.
Stud.io - Build LEGO designs online with friends.