Resource - Awesome Java

https://github.com/akullpp/awesome-java

Continuous Integration

• Jenkins - Provides server-based deployment services.
• TeamCity - JetBrain's CI solution with a free version.

Database

• Liquibase - An open source database-independent library for tracking, managing and applying database schema changes.
• MapDB - An embedded database engine that provides concurrent Java collections backed on disk or in off-heap memory.

http://www.quora.com/Schema-Evolution/Is-there-an-equivalent-of-Liquibase-for-Cassandra
Development

• ADT4J - Algebraic Data Types for Java (JSR-269 code generator).
• AspectJ - Seamless aspect-oriented programming extension.
• Auto - Collection of source code generators.
• DCEVM - Modification of the JVM that allows unlimited redefinition of loaded classes at runtime.
• Immutables - Scala-like case classes in standard Java.
• JHipster - A Yeoman source code generator to create Java applications based on Spring Bootand AngularJS.

Logging

• kibana - Analyzes and visualizes log files.
• Logback - Founded by the same developer as Log4j and proves to be a robust logging library with interesting configuration options via Groovy.
• logstash - Tool for managing log files.

Static Code Analysis

• Checkstyle - Static analysis of coding conventions and standards.
• Error Prone - Catches common Java mistakes as compile-time errors.
• FindBugs - Static analysis of bytecode to find potential bugs.
• PMD - Source code analysis of bad coding practices.
• SonarQube - Integrates other analysis components via plugins and provides an overview of the metrics over time.

Document Processing

• Apache POI - Supports OOXML (XLSX, DOCX, PPTX) as well as OLE2 (XLS, DOC or PPT).
• jOpenDocument - Processes the OpenDocument format.
• documents4j - Java API for document format conversion using third-party converters such as MS Word.

Apache Tika
Monitoring

• JavaMelody - Open-source performance monitoring and profiling.

Reactive libraries

• Reactor - Library for building reactive fast-data applications.
• Reactive Streams - Provide a standard for asynchronous stream processing with non-blocking backpressure.
• RxJava - Library for composing asynchronous and event-based programs using observable sequences from the JVM.

Security

• Apache Shiro - Performs authentication, authorization, cryptography and session management.
• Bouncy Castle - All-purpose cryptographic library. JCA provider, wide range of functions from basic helpers to PGP/SMIME operations.
• Cryptomator - Multiplatform transparent client-side encryption of files in the cloud.
• Keycloak - Integrated SSO and IDM for browser apps and RESTful web services. Currently in beta but looks very promising.
• PicketLink - PicketLink is an umbrella project for security and identity management for Java applications.
• Spring Security - Focuses on authentication/authorization and protects against several attack vectors.

PodCast/Audio
https://soundcloud.com/explore/technology

• The Java Posse (discontinued as of 02/2015)
• The Java Council

Web Sites

• Android Arsenal
• Google Java Style
• InfoQ
• Java Code Geeks
• Java.net
• Javalobby
• JavaWorld
• Java, SQL, and jOOQ
• JAXenter
• RebelLabs
• The Java Specialist' Newsletter
• TheServerSide.com
• The Takipi Blog
• Thoughts On Java
• Vanilla Java
• Vlad Mihalcea on Hibernate
• Voxxed

• Java 8 in Action