DIY Kids: https://diy.org/

PBS Design Squad: http://pbskids.org/designsquad/

3D Design: https://www.tinkercad.com/

Architectural Builder: https://edu.sketchup.com/app/

Caine's Arcade Cardboard Challenge: http://cainesarcade.com/

PBS Building Big: http://www.pbs.org/wgbh/buildingbig/