Prismaker System
Produces a construction block system that includes letter, number, and mosaic stickers to enhance the educational value.

Ritvik Mega Bloks
Canadian manufacturer of construction block sets for infants and children to age 12.

Han Nam Corporation
Producing plastic building block toys in Korea since 1990.

Vecta Blocks Inc.
Produces building block construction and educational toys for math, science and technology.

Learning Materials Workshop
Designs building toys using hardwood blocks, acrylic prisms, and flexible forms that develop children's thinking and imagination.

Lego Company
Producer of building blocks.

Atco Toys
Produces a large variety of building block sets and construction toys. Provides links to sales offices.

Kiblo
3D building blocks designed for infants and toddlers.