Sequences
Sequence operations
Virtual sequences
Making sequences with variables

Fixed-length sequences:
Arrays
Quotations
Strings
Byte arrays
Specialized arrays

Resizable sequences:
Vectors
Byte vectors
String buffers
Resizable sequence implementation

Associative mappings
Associative mapping operations
Linked assocs
Bidirectional assocs
References

Implementations:
Hashtables
Association lists
Enumerations

Double-ended queues
Deques

Implementations:
Double-linked lists
Search deques

Other collections
Sets
Lists
Disjoint sets
Interval maps
Heaps
Boxes
Directed graph utilities
Locked I/O buffers

There are also many other vocabularies tagged collections in the library.