Collections utilities which build on top of Guava and the standard collections library.
Commonly used utility classes (java.util.Collections related)
An experimental foundation library for Scala focussed on efficiency and clean design.
Jcommon Collections Foundation Package
Several utilities for and around the Java Collection API
Collections library of the Staccato-Commons project, focused on providing new abstractions that mix object oriented and functional programming style for dealing with iterable objects.
High performance bit set implementations.
Common utilities and classes for collections.
Brownies Collections complements the Java Collections Framework. GapList combines the strengths of both ArrayList and LinkedList. BigList is a list optimized for storing large number of elements. There are specialized List implementations for all primitive data types. The key collection classes offer support for keys and constraints for lists and collections.
Java Collections which are designed to be huge (may GB)