Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities.
 <ul><li>Bag interface for collections that have a number of copies of each object</li>
	<li>Buffer interface for collections that have a well defined removal order, like FIFOs</li>
	<li>BidiMap interface for maps that can be looked up from value to key as well and key to value</li>
	<li>MapIterator interface to provide simple and quick iteration over maps</li>
	<li>Type checking decorators to ensure that only instances of a certain type can be added</li>
	<li>Transforming decorators that alter each object as it is added to the collection</li>
	<li>Composite collections that make multiple collections look like one</li>
	<li>Ordered maps and sets that retain the order elements are added in, including an LRU based map</li>
	<li>Identity map that compares objects based on their identity (==) instead of the equals method</li>
	<li>Reference map that allows keys and/or values to be garbage collected under close control</li>
	<li>Many comparator implementations</li>
	<li>Many iterator implementations</li>
	<li>Adapter classes from array and enumerations to collections</li>
	<li>Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure</li>
	</ul>

Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities.  It provides collection class like Identity map, Ordered map, Reference map, Composite collections, Bag interface etc.

Apache Commons - Alternative to Java collection

Trove provides fast, lightweight implementations of the java.util Collections API. These implementations are designed to be pluggable replacements for their JDK equivalents. This gap in the JDK is often addressed by using the "wrapper" classes (java.lang.Integer, java.lang.Float, etc.) with Object-based collections. For most applications, however, collections which store primitives directly will require less space and yield significant performance gains. Trove eliminates the need to create Map.Entry wrappper objects for every item in a table and so reduces the O (big-oh) in the performance of the hashtable algorithm. The size of the tables used in Trove's maps/sets is always a prime number, improving the probability of an optimal distribution of entries across the table, and so reducing the the likelihood of performance-degrading collisions. Trove sets are not backed by maps, and so using a THashSet does not result in the allocation of an unused "values" array.

Trove provides fast, lightweight implementations of the java.util Collections API. These implementations are designed to be pluggable replacements for their JDK equivalents. This gap in the JDK is often addressed by using the "wrapper" classes (java.lang.Integer, java.lang.Float, etc.) with Object-based collections. For most applications, however, collections which store primitives directly will require less space and yield significant performance gains.

Trove - High performance collections for Java

Mango is a Java library consisting of a number of iterators, algorithms and functions, loosely inspired by the C++ Standard Template Library. It has support of 12 iterators, 16 generic algorithms and variety of function types. It supports Array Iterator, Bounded Iterator, Chain Iterator, Null Iterator, Reverse Iterator, Selecting Iterator, Singleton Iterator, Skipping Iterator, StringIterator, Tee Iterator, Transform Iterator, Zip Iterator. It supports function types such as Generators, Functions, Binary Functions, Predicates, Binary Predicates.

Mango is a Java library consisting of a number of iterators, algorithms and functions, loosely inspired by the C++ Standard Template Library. It has support of 12 iterators, 16 generic algorithms and variety of function types.

Mango - specialized iterators and functions

A Java-based database connection pooling utility, supporting Time-based expiry, Statement caching, Connection validation, and easy configuration using a pool manager.

DBPool - Java Database Connection Pooling

Xuggler is the easy way to uncompress, modify, and re-compress any media file (or stream) from Java. It provides simple API for encoding and decoding audio and video.

Xuggler - Media Tools API in Java

The JAVE (Java Audio Video Encoder) library is Java wrapper on the ffmpeg project. Developers can take take advantage of JAVE to transcode audio and video files from a format to another. You can separate and transcode audio and video tracks, you can resize videos, changing their sizes and proportions and so on. Many other formats, containers and operations are supported by JAVE.

Jave - Java Audio Video Encoder Library

SilverTunnel-NG is a Java library that implements and encapsulates all the complex network protocol stuff needed for anonymous communication over the Tor anonymity network. SilverTunnel-NG Netlib can be easily integrated in almost every existing and new Java application. The library requires Java 1.6/Java SE 6 or a newer version.

SilverTunnel-NG - Java library for easy accessing Tor network. 

Fast, simple, reliable. HikariCP is a "zero-overhead" production ready JDBC connection pool. At roughly 90Kb, the library is very light.

HikariCP - A high-performance JDBC connection pool

REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services. 
 
Repose can be run as a standalone application (either as a Linux service or using the JAR directly), or it can be deployed as a WAR file in a servlet container alongside your origin service. Repose can be run on the same server or on a different server, and it can be run across multiple servers for horizontal scaling. At its core, Repose is a proxy that allows services to use Enterprise Integration Patterns (EIP).

REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services. 

Repose - The REstful PrOxy Service Engine

Thumbnailator is a thumbnail generation library for Java. Learning how to use the Image I/O API, Java 2D API, image processing, image scaling techniques etc is fairly difficult task. Thumbnailator will take care of all those things for you. Thumbnailator is a single JAR file with no dependencies to external libraries, making development and deployment simple and easy. It also provides support to watermark, rotate, fluent API.

Thumbnailator - A thumbnail generation library for Java

This aims to be a complete implementation of XZ data compression in pure Java. Single-threaded streamed compression and decompression and random access decompression have been fully implemented. Threading is planned but it is unknown when it will be implemented. 

XZ for Java

Orchid is a Tor client implementation and library written in pure Java. Orchid will open a SOCKS5 listener which can be used as a standalone client where Tor would otherwise be used. It can also be used as a library by any application running on the JVM. 

Orchid - Tor client implementation and library written in pure Java

KivaKit is a set of integrated Java mini-frameworks that are potentially needed by any application or server. It extends the JDK to provide quick and easy solutions to common everyday software problems. It does this by providing new abstractions and APIs, and by simplifying existing APIs. It is composed of a number of nested sub-projects that are Java 11+ modules. These modules address different areas of concern in developing Java applications. The resources below will help you to get started.
 
KivaKit accelerates development and makes code simpler, safer and clearer. KivaKit increases modularity and code reuse. It supports enhancement to Application, Command line, Configuration, Logging, Email, Socket, FTP, Serialization and lot more.

KivaKit is a set of integrated Java mini-frameworks that are potentially needed by any application or server. It extends the JDK to provide quick and easy solutions to common everyday software problems. It does this by providing new abstractions and APIs, and by simplifying existing APIs. It is composed of a number of nested sub-projects that are Java 11+ modules. These modules address different areas of concern in developing Java applications. The resources below will help you to get started.

 KivaKit - Set of integrated Java mini-frameworks for everyday development. 

Bt is a lightweight framework for P2P-lovers and enthusiastic BitTorrent researchers, perfect choice for light enterprise and home usage and experimentation. It offers good performance, reliability and is highly customizable. With Bt you can create a production-grade BitTorrent client in a matter of minutes. Bt is still in its' early days, but is actively developed and designed with stability and maintainability in mind.

Bt - Java BitTorrent Done Right!

CSVeed is a Java library for reading Comma Separated Value (CSV) files and exposing those either as Rows or Java Beans. It is a Java toolkit for mapping CSV-to-Bean mapping and vice versa.

CSVeed - Light-weight, easy-to-use Java-based CSV utility

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