| 1. Atco Toys |
| Produces a large variety of building block sets and construction toys. Provides links to sales offices. |
| http://www.atcotoys.com/ |
| 2. DIDA Development |
| Makes educational electronic toy brick. Taiwan. |
| http://www.dida.ttnet.net |
| 3. Han Nam Corporation |
| Producing plastic building block toys in Korea since 1990. |
| http://hannamcorp.en.ecplaza.net/ |
| 4. Kiblo |
| 3D building blocks designed for infants and toddlers. |
| http://www.kiblo.com/ |
| 5. 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/ |
