Batik is a Java(tm) technology based toolkit for applications or applets that want to use images in the Scalable Vector Graphics (SVG) format for various purposes, such as viewing, generation or manipulation.

EMMA is a fast Java code coverage tool based on bytecode instrumentation. It differs from the existing tools by enabling coverage profiling on large scale enterprise software projects with simultaneous emphasis on fast individual development.

The Lightweight Java Game Library (LWJGL) is a solution aimed directly at professional and amateur Java programmers alike to enable commercial quality games to be written in Java. LWJGL provides developers access to high performance crossplatform libraries such as OpenGL (Open Graphics Library) and OpenAL (Open Audio Library) allowing for state of the art 3D games and 3D sound. Additionally LWJGL provides access to controllers such as Gamepads, Steering wheel and Joysticks. All in a simple and straight forward API....

Building blocks for computational design (Java & Processing)

This is a growing selection of useful classes created for mostly computational design projects, but which might be helpful for others too. After 3 years of ongoing development the collection consists of:...

The leading RESTful web framework for Java

Do you want to blend your web services, web sites and web clients into
unified web applications exposing and consuming RESTful web APIs?

Leverage the open source Restlet Framework and its unique Java API available in six consistent editions: Java SE, Java EE, OSGi, GAE, Android and GWT!...

Apache Archiva is an extensible repository management software that helps taking care of your own personal or enterprise-wide build artifact repository. It is the perfect companion for build tools such as Maven, Continuum, and ANT.

Archiva offers several capabilities, amongst which remote repository proxying, security access management, build artifact storage, delivery, browsing, indexing and usage reporting, extensible scanning functionality... and many more!...

XWiki is a WikiWiki clone written in Java that supports many popular features of other Wikis like the Wiki syntax, version control, attachments, security, and searching, but also many advanced features like templates, database and dynamic development using the velocity or groovy scripting language, a plugin system and skinability, J2EE scalability, XML/RPC remote API, Portlet integration, statistics, an RSS feed, PDF exporting, and WYSIWYG editing....

The Open Web SSO project provides core identity services to simplify the implementation of transparent single sign-on as a security component in a network infrastructure. It provides the foundation for integrating diverse web applications that might typically operate against a disparate set of identity repositories and are hosted on a variety of platforms such as web and application servers....

EclEmma is a Java code coverage tool for Eclipse. It launches from within the workbench like JUnit test. Runs can directly be analyzed for code coverage.
Coverage results are immediately summarized and highlighted in the Java source code editors. EclEmma does not require modifying your projects or performing any other setup....

Working with Hibernate is very easy and developers enjoy using the APIs and the query language. Even creating mapping metadata is not an overly complex task once you've mastered the basics. Hibernate Tools makes working with Hibernate or EJB 3.0 persistence even more pleasant....