ThinkWorks - Creates and sells educational block toys such as magnetic or mosaic games. USA. - http://www.thinkandthrive.com
DIDA Development - Makes educational electronic toy brick. Taiwan. - http://www.dida.ttnet.net
Han Nam Corporation - Producing plastic building block toys in Korea since 1990. - http://hannamcorp.en.ecplaza.net/
Kiblo - 3D building blocks designed for infants and toddlers. - http://www.kiblo.com/
Atco Toys - Produces a large variety of building block sets and construction toys. Provides links to sales offices. - http://www.atcotoys.com/
Lego Company - Producer of building blocks. - http://www.lego.com/
Learning Materials Workshop - Designs building toys using hardwood blocks, acrylic prisms, and flexible forms that develop children's thinking and imagination. - http://www.learningmaterialswork.com/
Ritvik Mega Bloks - Canadian manufacturer of construction block sets for infants and children to age 12. - http://www.megabloks.com/