Hudson is a popular Continuous Integration Server developed by Oracle as an Open Source product at the Eclipse Foundation. Hudson monitors the execution of repeated jobs, such as building a software project and makes it easier for users to obtain a fresh build and inspect the build results....

A seamless, aspect-oriented extension to the Java programming language. Provides clean modularization of crosscutting concerns, such as error checking and handling, synchronization, context-sensitive behavior, performance optimizations, monitoring and logging, debugging support, and multi-object protocols....

Velocity is a Java-based template engine. It permits anyone to use a simple yet powerful template language to reference objects defined in Java code.

Filesystem in Userspace is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. It also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations.

Scala is a general purpose programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages. It is also fully interoperable with Java....

Vaadin is a web application framework for Rich Internet Applications (RIA). In contrast to Javascript libraries and browser-plugin based solutions it features a server-side architecture, which means that the majority of the logic runs on the servers. Ajax technology is used at the browser-side to ensure a rich and interactive user experience....

Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage.

hsqldb is a relational database engine written in Java with a JDBC driver that supports a subset of ANSI SQL:1999. It offers a small, fast database engine. Embedded and server modes are available. It includes tools such as a minimal Web server, in-memory query and management tools (which can be run as applets or servlets, too), a test framework, PHP compatibility, Eclipse and NetBeans IDE compatibility, and a number of demonstration examples....

A comprehensive security module for The Spring Framework. Delivers authentication, authorization, security interception, and run-as authentication replacement. Extensive use of well-targeted interfaces facilitate easy customisation by developers.

JasperReports is a Java reporting library. XML report templates are used to generate ready to print documents using data from customizable data sources, including JDBC. The output can be delivered to the screen, printer, or stored in PDF, HTML, XLS, RTF, ODT, DOCX, CSV, TXT and XML format....