c3p0 is an easy-to-use library for making traditional JDBC drivers "enterprise-ready" by augmenting them with functionality defined by the jdbc3 spec and the optional extensions to jdbc2. It provides (DriverManager-based) JDBC drivers with JNDI-bindable DataSources, including DataSources that implement Connection and Statement Pooling, as described by the jdbc3 spec and jdbc2 std extension. A connection pool is used to minimize the number of connections opened between application and database. Statement pool stores a partially compiled version of a statement in order to increase performance.

c3p0 is an easy-to-use library for making traditional JDBC drivers "enterprise-ready" by augmenting them with functionality defined by the jdbc3 spec and the optional extensions to jdbc2. It provides (DriverManager-based) JDBC drivers with JNDI-bindable DataSources, including DataSources that implement Connection and Statement Pooling, as described by the jdbc3 spec and jdbc2 std extension.

c3p0 - JDBC3 Connection and Statement Pooling

pac4j  is a Java security engine to authenticate users, get their profiles and manage their authorizations in order to secure Java web applications. It supports most authentication mechanisms: OAuth (Facebook, Twitter, Google, Yahoo...), CAS, HTTP (form, basic auth...), OpenID, SAML, Google App Engine, OpenID Connect, JWT, LDAP, RDBMS, MongoDB and Stormpath and authorization checks.


pac4j - The security engine to protect all your Java web applications

The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. It transparently supports WebSockets, Server Sent Events (SSE), Long-Polling, HTTP Streaming (Forever frame) and JSONP. Its mission is to make real time apps possible in every browser, library and mobile device, blurring the differences between the different transport mechanisms.
 
The Atmosphere Framework Stack works on all Servlet based servers, Spring Boot and frameworks like Netty, Play! Framework and Vert.x. We support a variety of extensions like Apache Kafka, Hazelcast, RabbitMQ, Redis and many more.

The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. It transparently supports WebSockets, Server Sent Events (SSE), Long-Polling, HTTP Streaming (Forever frame) and JSONP. Its mission is to make real time apps possible in every browser, library and mobile device, blurring the differences between the different transport mechanisms.

Atmosphere - Realtime Client Server Framework for the JVM

BoneCP is a fast, Java database connection pool (JDBC Pool) library. Its feature include:
 <UL>
	<LI>Highly scalable, fast connection pool</LI>
	<LI>Callback (hook interceptor) mechanisms on a change of connection state</LI>
	<LI>Statement caching support</LI>
	<LI>Automatic resizing of pool</LI>
	<LI>Support for obtaining a connection asynchronously</LI>
	<LI>Easy mechanism to execute a custom statement on each newly obtained connection</LI>
	<LI>Support to switch to a new database at runtime without shutting down an application</LI>
	<LI>JMX support </LI>
	<LI>Ability to replay any failed transaction automatically </LI>
	<LI>Datasource/Hibernate support capable</LI>
	<LI>Debugging support and Hooks available</LI>
 </UL>

BoneCP is a fast, Java database connection pool (JDBC Pool) library.

BoneCP - The JDBC Connection Pool

ROME is an set of Java tools for parsing, generating and publishing RSS and Atom feeds. The core ROME library depends only on the JDOM XML parser and supports parsing, generating and converting all of the popular RSS and Atom formats including RSS 0.90, RSS 0.91 Netscape, RSS 0.91 Userland, RSS 0.92, RSS 0.93, RSS 0.94, RSS 1.0, RSS 2.0, Atom 0.3, and Atom 1.0. You can parse to an RSS object model, an Atom object model or an abstract SyndFeed model that can model either family of formats. 
 It provides API to generate, consume and convert RSS feeds.

ROME is an set of Java tools for parsing, generating and publishing RSS and Atom feeds. The core ROME library depends only on the JDOM XML parser and supports parsing, generating and converting all of the popular RSS and Atom formats including RSS 0.90, RSS 0.91 Netscape, RSS 0.91 Userland, RSS 0.92, RSS 0.93, RSS 0.94, RSS 1.0, RSS 2.0, Atom 0.3, and Atom 1.0. You can parse to an RSS object model, an Atom object model or an abstract SyndFeed model that can model either family of formats.

ROME

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more. 
It is memory efficient. Its most interesting class is <A HREF="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/MapMaker.html" target="_blank">MapMaker</A>, which is a ConcurrentMap builder, providing any combination of these features: soft or weak keys, soft or weak values, timed expiration, and on-demand computation of values. Check out their video in <A HREF="http://www.youtube.com/watch?v=ZeO%5FJ2OcHYM" target="_blank">Youtube</A>.

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more.

Guava - Google Core Libraries for Java

A powerful & easy to use chart library for Android. It supports many different chart types: LineChart, BarChart (vertical, horizontal, stacked, grouped), PieChart, ScatterChart, CandleStickChart (for financial data), RadarChart (spider web chart), BubbleChart. It can smooth rendering for up to 10.000 data points in Line- and BarChart.

MPAndroidChart - A powerful Android chart view / graph view library

SMSLib is a Java library which allows you to send/receive SMS messages via a compatible GSM modem or GSM phone. SMSLib also supports some bulk sms operators (for outbound messaging only). Its feature include
 <ul>
	<li>Supports GSM phones and GSM modems connected via serial port interfaces or IP interfaces.</li>
	<li>Works with PDU/TEXT protocols.</li>
	<li>Supports Inbound & Outbound simple text messages.</li>
	<li>Works with 7bit, 8bit and UCS2 (Unicode) message encodings.</li>
	<li>Supports Inbound & Outbound big (multipart) messages.</li>
	<li>Flash messaging.</li>
	<li>Outbound messages with port information / addressing.</li>
	<li>Outbound WAP PUSH SI messages.</li>
	<li>Status (Delivery) Report messages.</li>
	<li>Basic GSM information available: Modem, Manufacturer, S/W revision, Signal level, etc.</li>
	<li>Supports a few bulk operators, using http/https protocols.</li>
	<li>Support the SMPP protocol.</li>
	<LI>Multiple Gateways</LI>
	<LI>Sending Priorities</LI>
	<LI>Synchronous / Asynchronous Sending and Receiving messages</LI>
	<LI>Callbacks</LI>
	<LI>Custom Sender ID</LI>
	<LI>Encrypted Messages</LI>
</ul>

SMSLib is a Java library which allows you to send/receive SMS messages via a compatible GSM modem or GSM phone. SMSLib also supports some bulk sms operators (for outbound messaging only).

SMSLib - Java SMS library

bitcoinj is a library for working with the Bitcoin protocol. It can maintain a wallet, send/receive transactions without needing a local copy of Bitcoin Core and has many other advanced features.
 
Highly optimised lightweight simplified payment verification (SPV) mode. In this mode, only a small part of the block chain is downloaded, making bitcoinj suitable for usage on constrained devices like smartphones or cheap virtual private servers.

bitcoinj is a library for working with the Bitcoin protocol. It can maintain a wallet, send/receive transactions without needing a local copy of Bitcoin Core and has many other advanced features.

Bitcoinj - A library for working with Bitcoin

Picasso is a powerful image downloading and caching library for Android. Images add much-needed context and visual flair to Android applications. Picasso allows for hassle-free image loading in your application—often in one line of code!
 
<code>
Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);
</code>

Picasso is a powerful image downloading and caching library for Android. Images add much-needed context and visual flair to Android applications. Picasso allows for hassle-free image loading in your application—often in one line of code!

Picasso - A powerful image downloading and caching library for Android

FMJ is an alternative to Java Media Framework (JMF), while remaining API-compatible with JMF. It aims to produce a single API/Framework which can be used to capture, playback, process, and stream media across multiple platforms. The sub-projects, FFMPEG-Java and Theora-Java, are Java wrappers for FFMPEG and Vorbis respectively. Its sister project is LTI-CIVIL and it is used as the primary video capture device library. 

FMJ - Freedom for Media in Java

Jongo helps to query in Java as in Mongo shell. Mongo query language isn't available in Java, Jongo fixes that. Copy/paste your queries to string. It provides support to save and find objects into and from collections. You can use embedded Jackson marshalling or create your own.

Jongo - Query in Java as in Mongo shell

Picocli is a one-file Java framework for parsing command line arguments and generating polished, easily tailored usage help messages. Java command line parser with both an annotations API and a programmatic API, featuring usage help with ANSI colors, autocomplete and nested subcommands. In a single file, so you can include it in source form. This lets users run picocli-based applications without requiring picocli as an external dependency.

picocli - a mighty tiny command line interface

A collection of Concurrent and Highly Scalable Utilities. These are intended as direct replacements for the java.util.* or java.util.concurrent.* collections but with better performance when many CPUs are using the collection concurrently. Single-threaded performance may be slightly lower. 
 The other utilities do not have direct JDK replacements includes 
	<UL>
		<LI>NonBlockingHashMap - Fast, concurrent, lock-free HashMap. Linear scaling to 768 CPUs</LI>
		<LI>NonBlockingHashMapLong - Same as above, but using primitive 'long' keys</LI>
		<LI>NonBlockingHashSet - A Set version of NBHM</LI>
		<LI>NonBlockingSetInt - A fast fully concurrent BitVector</LI>
		<LI>Counter - A simple counter that scales linearly even when extremely hot</LI>
	</UL>

A collection of Concurrent and Highly Scalable Utilities. These are intended as direct replacements for the java.util.* or java.util.concurrent.* collections but with better performance when many CPUs are using the collection concurrently. 


high-scale-lib

Creating a new connection for each user can be time consuming (often requiring multiple seconds of clock time), in order to perform a database transaction that might take milliseconds. Opening a connection per user can be unfeasible in a publicly-hosted Internet application where the number of simultaneous users can be very large. Accordingly, developers often wish to share a "pool" of open connections between all of the application's current users.

DBCP - Java Database Connection Pooling library

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