Domestic Robots:

irobot.com

knightscope.com

Electronics:

eeweb.com: A comprehensive site about general electronics.

https://www.sparkfun.com/

Educational Robot Sites:

ez-robot.com

robotslab.com: A general news site about robots, hobby robots

General Robot Sites:

robots.com

spectrum.ieee.org/robotics

phys.org/technology-news/robotics/

Humanoid Robot Sites:

world.honda.com/ASIMO/

ai.mit.edu/projects/humanoid-robotics-group/

bostondynamics.com/

International Sites:

French:

robotbuzz.fr: A general news site about robots, hobby robots

Spanish:

revistarobot.com: General robotics news. Meaning robot magazine, this is one of the most visited robotics websites in Spanish, both in Spain and Latin America.

Turkish:

robothaber.com: A general news site

robotforumu.com: Meaning Robot Forum, this is the most visited robotics forum website in Turkish language.

Research Centers:

ihmc.us/

Sellers:

robotshop.com

robotstore.com

Software:

ros.org

Specific Robotics subjects:

autonomouscars.com: Site dedicated to autonomous cars. It contains an excellent in depth article which many sites reference.

Technology (general) websites:

technologygraph.com: General news about technology and technological advances

Universities:

ri.cmu.edu/

robots.mit.edu/