Project-Based K12 Engineering

EDW Website: http://www.engineeringdesignworkshop.com/

Mrjonathan.net: https://www.mrjonathan.net/

See especially: 

PBL STEM and Making

https://sites.google.com/aceraschool.org/pbllearningandmaking/home

Older Sites(2016): 

EV3 Robotics

https://westonk12engineering.org/robotics/index.htm

K12 Engineering in Massachusetts(2015)

https://www.engineeringk12mass.org/

Tufts Center for Engineering Education Outreach(CEEO)
https://ceeo.tufts.edu/

NuVu Studio Cambridge
https://cambridge.nuvustudio.com/

MIT K-12 Outreach Programs
https://outreach.mit.edu/

See more at : https://www.engineeringk12mass.org/outreach-by-universities.html

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Design Squad Global(PBS)
https://pbskids.org/designsquad/

Teach Engineering
https://www.teachengineering.org/

Scratch

https://scratch.mit.edu/

Offshoots:

Makeblock (China)

https://www.makeblock.com/

https://ide.mblock.cc/

Stempedia/Pictoblox(India)

https://thestempedia.com/

Lego Spike Prime Robotics

https://education.lego.com/es-es/

MicroBit
https://microbit.org/es-es/