Azureus is a BitTorrent protocol implementation that offers multiple torrent downloads, queuing/priority systems (on torrents and files), start/stop seeding options, and instant access to numerous pieces of information about your torrents. It includes an embedded tracker that is easily set up and ready to use....

JBoss Application Server is the #1 most widely used Java application server on the market. Hundreds of professional open source developers have contributed to the JBoss Application Server over the years and community contributors are not only welcome but encouraged. In fact all JBoss employed contributors to the JBoss Application Server were hired from the community and each of them contributed to an open source project in one way or another....

Apache Jackrabbit is a fully conforming implementation of the Content Repository for Java Technology API (JCR). A content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more....

FindBugs is a defect detection tool for Java that uses static analysis to look for more than 200 bug patterns, such as null pointer dereferences, infinite recursive loops, bad uses of the Java libraries and deadlocks. FindBugs can identify hundreds of serious defects in large applications (typically about 1 defect per 1000-2000 lines of non-commenting source statements). FindBugs is open source, and has been downloaded more than 230,000 times, and is used by many major companies and financial institutions. ...

ZXing (pronounced "zebra crossing") is an open-source, multi-format 1D/2D barcode reader library implemented in Java.

Apache Axis2 is a complete re-design and re-write of the widely used Apache Axis SOAP stack to build on the lessons learnt from Apache Axis.

Apache Axis2 not only supports SOAP 1.1 and SOAP 1.2, but it also has integrated support for the widely popular REST style of Web services....

OpenLDAP Software is the premier open source implementation of the Lightweight Directory Access Protocol. It is the most reliable and standards-compliant. Since 2005 it has been the world's fastest; it is the gold standard against which all other directory software is compared....

xu‧ggle (zŭ' gl) v. To freely encode, decode, and experience audio and video.

With Xuggle you can write Java programs that decode or encode video.

It incorporates FFMPEG, but adds a simpler interface that is safe to use from Java-like languages (e.g. garbage collection) and tries hard to make sure usage of FFMPEG features doesn't crash a JVM....

Joda-Time provides a quality replacement for the Java date and time classes. The design allows for multiple calendar systems, while still providing a simple API. The 'default' calendar is the ISO8601 standard which is used by XML. The Gregorian, Julian, Buddhist, Coptic and Ethiopic systems are also included, and we welcome further additions. Supporting classes include time zone, duration, format and parsing....

JFreeChart is a chart library for the Java platform that supports a wide range of charts including pie charts (2D and 3D), bar charts (horizontal and vertical, regular or stacked, with optional 3D-effects), line charts, XY plots, scatter plots, time series charts, high/low/open/close charts, candlestick plots, Gantt charts, Pareto charts, combination charts, and more. It is suitable for use in applications, applets, servlets, and JSP....