The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.
Last Release： 2019-02-05
The Trove library provides high speed regular and primitive collections for Java.
Last Release： 2014-12-04
Fork of trove4j library used in IntelliJ Platform.
Last Release： 2018-12-11
Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0
Last Release： 2010-03-20
fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit)
Last Release： 2018-09-14