Spider containers are a set of container classes for Borland's 
Object Pascal language. It is compatible with the Object Pascal 
implementation found in versions 1.0 and 2.0 of Borland's 
Delphi(tm) product. This class library was motivated by the lack 
of generic classes (called templates in C++) in the language 
definition. All the container classes are type-safe; that is, 
when a container is created, the type of object that the container 
may hold is specified, and all additions to the container must be 
of that type.

For more information, see

http://www.cam.org/~mibra/spider/