Eagle DNS [1] a powerful, multithreaded, platform independent authorative DNS server written in Java. It is based on the very reliable and proven dnsjava API and it supports both primary zones and secondary zones using secured AXFR transfers.

Eagle DNS is copyright Robert “Unlogic” Olofsson and released under the LGPLv3 license.

[1] http://www.unlogic.se/projects/eagledns

GCALDaemon [1] is an OS-independent Java program that offers two-way synchronization between Google Calendar [2] and various iCalendar compatible calendar applications. GCALDaemon is primarily designed as a calendar synchronizer but it can also be used as a Gmail notifier, Address Book importer, Gmail terminal and RSS feed converter.

GCALDaemon is released under Apache License version 2.0.

[1] http://gcaldaemon.sourceforge.net
[2] http://www.google.com/calendar/

The Simple Logging Facade for Java or (SLF4J) [1] serves as a simple facade or abstraction for various logging frameworks, e.g. java.util.logging, log4j and logback, allowing the end user to plug in the desired logging framework at deployment time.

SLF4J source code and binaries are distributed under the MIT license.

[1] http://www.slf4j.org/

jcouchdb [1] is a java5 couchdb driver using the svenson JSON library.

It offers features to support the full range from totally dynamic parsing to parsing into concrete java POJOs, including a mix in between.

jcouchdb is in the early stages of development but there’s a test suite proving that it does at least most of the couchdb operations.

Jcouchdb is released under BSD license.

[1] http://code.google.com/p/jcouchdb/

XMLUnit [1] for Java provides two JUnit extension classes, XMLAssert and XMLTestCase, and a set of supporting classes (e.g. Diff, DetailedDiff, Transform, SimpleXpathEngine, Validator, NodeTest) that allow assertions to be made about:

• The differences between two pieces of XML
• The outcome of transforming a piece of XML using XSLT
• The evaluation of an XPath expression on a piece of XML
• The validity of a piece of XML
• Individual nodes in a piece of XML that are exposed by DOM Traversal

XMLUnit for Java can also treat HTML content (even badly-formed HTML) as valid XML to allow these assertions to be made about the content of web pages too.

[1] http://xmlunit.sourceforge.net/

jOpenDocument [1] is a free library for developers looking to use Open Document files without OpenOffice.org.

jOpenDocument is Open Source (under GPL or commercial license).

You can automate the document creation and manipulation process. You can use jOpenDocument to:

• Generate dynamic documents from Java, XML or databases
• Display and print files with built-in viewers
• Split, concatenate, and manipulate pages
• Automate filling out of template (created by OpenOffice or not)
• Use your preferred langage via standard ScriptEngine interface
• And much more…

[1] http://www.jopendocument.org/

Video4Linux4Java [1] (v4l4j) is a GPL’d java package providing simple access to the capture interface of the Video4Linux (V4L) API from Java. Using v4l4j, an application can:

• retrieve information about a video device, such as the number and type of video inputs, supported image formats, resolutions & video standards and available tuners,
• capture frames from any V4L-supported devices, which includes USB/Firewire webcams, video capture cards and tuner cards.
• access video controls, such as brightness, contrast, gain, Tilt, Focus, …
• access and control tuners (get / set frequency, access to received signal strength, …)

[1] http://code.google.com/p/v4l4j/

Hudson [1] monitors executions of repeated jobs, such as building a software project or jobs run by cron. Among those things, current Hudson focuses on the following two jobs:

1. Building/testing software projects continuously, just like CruiseControl or DamageControl. In a nutshell, Hudson provides an easy-to-use so-called continuous integration system, making it easier for developers to integrate changes to the project, and making it easier for users to obtain a fresh build. The automated, continuous build increases the productivity.
2. Monitoring executions of externally-run jobs, such as cron jobs and procmail jobs, even those that are run on a remote machine. For example, with cron, all you receive is regular e-mails that capture the output, and it is up to you to look at them diligently and notice when it broke. Hudson keeps those outputs and makes it easy for you to notice when something is wrong.

Hudson can be extended by plugins and can be integrated into IDEs like Eclipse. There are also a lot of tools like for example Firefox Add on. It is written in Java (1.6) released under the MIT license.

Update
Hudson now provides Debian packages.

[1] https://hudson.dev.java.net/