Construction

Astro-logix - Create complex and beautiful fractal stars and 3D geometric shapes.
www.astro-logix.com/

Atollo - Flexible models, from articulated figures to geometric space structures.
www.atollo.com/

The Construction Site - A large variety of construction toys including brand names such as t.c. timber, K'nex, Lincoln Logs, Tinkertoy and Exin Castles.
www.constructiontoys.com/

Gridblox - Cubical wooden blocks with notched corners that interlock by gravity.
www.aptitude-testing.com/gridblox.htm

Wedgits - Wedge shaped building blocks construction set. Includes design ideas and worldwide list of dealers.
wedgits.com/