Apache Hadoop is a framework for running applications on large clusters built of commodity hardware. The Hadoop framework transparently provides applications both reliability and data motion. Hadoop implements a computational paradigm named Map/Reduce, where the application is divided into many small fragments of work, each of which may be executed or reexecuted on any node in the cluster. In addition, it provides a distributed file system (HDFS) that stores data on the compute nodes, providing very high aggregate bandwidth across the cluster. Both Map/Reduce and the distributed file system are designed so that node failures are automatically handled by the framework.

Apache Hadoop is a framework for running applications on large clusters built of commodity hardware. Hadoop common supports other Hadoop subprojects

Hadoop Common

Avro is a data serialization system. Avro provides: Rich data structures. A compact, fast, binary data format. A container file, to store persistent data. Remote procedure call (RPC). Simple integration with dynamic languages. Code generation is not required to read or write data files nor to use or implement RPC protocols. Code generation as an optional optimization, only worth implementing for statically typed languages.

Avro is a data serialization system. It is a subproject of Apache Hadoop.

Avro

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

TagSoup, a SAX-compliant parser written in Java that, instead of parsing well-formed or valid XML, parses HTML as it is found in the wild: poor, nasty and brutish, though quite often far from short. TagSoup is designed for people who have to process this stuff using some semblance of a rational application design. TagSoup also includes a command-line processor that reads HTML files and can generate either clean HTML or well-formed XML that is a close approximation to XHTML.

TagSoup - SAX-compliant parser in Java

Apache PDFBox is an open source Java PDF library for working with PDF documents. This library allows creation of new PDF documents, manipulation of existing documents and the ability to extract content from documents. It provides support for adding bookmarks, fonts, text extraction, Encryption, PDF printing and lot more. It has <A HREF="http://pdfbox.apache.org/userguide/dot_net.html">.NET support</A>. 

 Form filling is one of most important feature. It helps to fill in form data FDF and XFDF. It has command line utlities for most of the jobs. For example PDFToImage utility create an image for every page in the PDF document. 
 
 PDF documents could be splitted to multiple documents and also multiple PDF documents could be merged to one. Lucene Search Engine is integrated to do full text search.

Apache PDFBox is an open source Java PDF library for working with PDF documents. This library allows creation of new PDF documents, manipulation of existing documents and the ability to extract content from documents. It provides support for adding bookmarks, fonts, text extraction, Encryption, PDF printing and lot more.

PDFBox - Java PDF library

Apache Jackrabbit is a Content Repository fully conforming to JCR specification. Jackrabbit content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more. It provides access to its repository via Web Interface, Command line , WebDAV and RMI. The content could be stored in file system or in database. It supports REST API so that it could be accessed from any programming language.

Apache Jackrabbit is a Content Repository fully conforming to JCR specification. Jackrabbit content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more.

Jackrabbit - Content Repository in Java

Apache OFBiz is an open source enterprise automation software project. It means ERP (Enterprise Resource Planning), CRM (Customer RelationShip Management), E-Business / E-Commerce, SCM (Supply Chain Management), MRP (Manufacturing Resources Planning), CMMS/EAM (Maintenance Management System/Enterprise Asset Management), POS (Point Of Sale), and so on. 

 Its applications includes Catalog management, Promotion & Pricing management, Order management (sales & purchase), Customer management, Warehouse management, Accounting (invoice, payment & billing accounts, fixed assets), Manufacturing management, General work effort management (events, tasks, projects, requests, etc), Content management (for product content, web sites, general content, blogging, forums, etc) and lot more.

 <img src="/AppImages/Article/ofbiz_img1.jpg" alt="" class="float-center">

Apache OFBiz is an open source enterprise automation software project. It means ERP (Enterprise Resource Planning), CRM (Customer RelationShip Management), E-Business / E-Commerce, SCM (Supply Chain Management), MRP (Manufacturing Resources Planning), CMMS/EAM (Maintenance Management System/Enterprise Asset Management), POS (Point Of Sale), and so on.

OFBiz - Apache Open For Business Project

Voldemort is a distributed key-value storage system. Data is automatically replicated over multiple servers. Data is automatically partitioned so each server contains only a subset of the total data. 
Server failure is handled transparently. It is used at LinkedIn for certain high-scalability storage problems where simple functional partitioning is not sufficient.

Project-voldemort - A distributed database, Clone of Amazon's Dynamo

Libgdx is a Java game development framework that provides a unified API that works across all supported platforms. The framework provides an environment for rapid prototyping and fast iterations. Instead of deploying to Android/iOS/Javascript after each code change, you can run and debug your game on the desktop, natively. Desktop JVM features like code hotswapping reduce your iteration times considerably.

libgdx - Desktop/Android/HTML5/iOS Java game development framework

Commons Math is a library of lightweight, self-contained mathematics and statistics components addressing the most common problems not available in the Java programming language. it has support for Linear Algebra, Probability Distributions, Numerical Algebra, Statistics, Transform methods, Least Square etc.

Commons Math: The Apache Commons Mathematics Library

JFrog is an universal Artifact Repository Manager on the market, JFrog Artifactory fully supports software packages created by any language or technology. As a local proxy to the outside world, Artifactory guarantees consistent access to the components needed by your build tools. Remote artifacts are cached locally for reuse, so that you don’t have to download them over and over again. Automate all aspects of artifact management using a powerful REST API.


JFrog - Artifact Repository Manager

RESTEasy is a JBoss project that provides various frameworks to help you build RESTful Web Services and RESTful Java applications. It is a portable implementation of the JAX-RS specification. JAX-RS is a JCP specification that provides a Java API for RESTful Web Services over the HTTP protocol. It is portable to Tomcat and many other app-server. It has rich set of providers for: XML, JSON, YAML, Fastinfoset, Multipart, XOP, Atom, etc.

RESTEasy - Rest Framework for Java

Solrj is the official java client to access Solr. It offers a java interface to add, update, and query the solr index. SolrJ hides a lot of the details of connecting to Solr and allows your application to interact with Solr with simple high-level methods. The SolrJ API is included with Solr, so you do not have to download or install anything else.

Solrj - Official Solr client

The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH). These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. 

Google Authenticator - Two factor authentication

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

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