Google Collections Library 1.0 Is Final
The Google Collections Library team have released version 1.0-final, following five previous release candidates. Google Collections Library builds on the Java Collections Framework, to provide a set of implementations and new collection types, including Multimap, Multiset and BiMap. It also features MapMaker, a ConcurrentMap builder for concurrent hash maps.
It is licensed under the Apache License 2.0 and is built on Java 5.