A collection of easy to use multi-purpose Javabeans providing commonly used methods for handling I/O, arithmetic, and general commonly used algorithms used in computer science. [Open source, BSD License]

A pure Java Subversion (SVN) client library that provides high level of control over subversion repository operations. [Open source, BSD-like]

A financial library for automated stock trading, including many technical indicators and quote retreivers to fetch both intraday and historical stock quotes from various internet sources. [Open source, GPL]

Generic, extensible object-pooling library to cut down on object creation and garbage collection, thus improving performance. [Open Source, LGPL]

Java workflow engine, Java job scheduler, and Java business process management (BPM) engine. APIs are available for Java, J2EE, XML, and Web Services. Flux can also be used without programming via its user interfaces. [Commercial]

ICEbrowser (HTML component for internet browsing in Java), ICEbox (a mail component), ICEtoolkit (a GUI toolkit based on lightweight AWT components) and ICEssl (a module provides support for secure networking over the Internet, and full support for bo...

A Java library consisting of a number of iterators, algorithms and functions, loosely inspired by the C++ Standard Template Library. [Open source, LGPL]

Task scheduling system for Java, similar to Unix cron and at daemons. Fires events at specified times. Alarms are added dynamically in any order and can be one-shot or repetitive. [Open Source, LPGL]

An open source rule based scripting language for information integration and agents in Java, combining imperative and declarative programming. Distributed agents communicating via JMS or JADE use reaction rules in a natural syntax.

Java Application Framework for business development. [Freeware]