An easy to implement CAPTCHA framework to generate image and audio challenges, for Java 1.5 and Java 6.

SimpleCaptcha - Java library for generating CAPTCHA challenge/answer pairs

DrJava is a lightweight programming environment for Java designed to foster test-driven software development. It includes an intelligent program editor, an interactions pane for evaluating program text, a source level debugger, and a unit testing tool.

DrJava - Lightweight development environment for writing Java programs

Ldap Synchronization Connector reads from any data source including databases, LDAP directories or files and transforms and compares this data to an LDAP directory. These connectors can then be used to continuously synchronize a data source to a directory, for a one shot import or just to compare differences by outputting CSV or LDIF format reports. 
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LSC offers a powerful transformation engine, based on a scripting language, to easily manipulate data on the fly.

Ldap Synchronization Connector reads from any data source including databases, LDAP directories or files and transforms and compares this data to an LDAP directory. These connectors can then be used to continuously synchronize a data source to a directory, for a one shot import or just to compare differences by outputting CSV or LDIF format reports.

LSC engine - LDAP Synchronization Connector

JLine is a Java library for handling console input. It is similar in functionality to BSD editline and GNU readline but with additional features that bring it in par with ZSH line editor. People familiar with the readline/editline capabilities for modern shells (such as bash and tcsh) will find most of the command editing features of JLine to be familiar.

Jline3 - Java library for handling console input

Backport of functionality based on JSR-310 to JDK1.7. This is NOT an implementation of JSR-310. Instead, this is a simple backport intended to allow users to quickly use the JSR-310 API on Java SE 6 and 7. The backport should be referred to using the "ThreeTen" name.

ThreeTen - Backport of DateTime functionality based on JSR-310 to Java SE 6 and 7

JUNG is a software library that provides a common and extensible language for the modeling, analysis, and visualization of data that can be represented as a graph or network. Its basis in Java allows JUNG-based applications to make use of the extensive built-in capabilities of the Java API, as well as those of other existing third-party Java libraries.

JUNG: Java Universal Network/Graph Framework


jcabi-jdbc is a lightweight wrapper of JDBC. It is very convenient to use when you don't need a full-scale ORM (like Hibernate), but want just to select, insert, or update a few rows in a relational database.

jcabi-jdbc - Fluent Wrapper of JDBC

JMagallanes is an end user application for Olap and Dynamic Reports written in Java/J2EE. It combines static reports (based on JasperReports), a Swing pivot table for OLAP analysis, and charts (based on JFreeChart). It reads from many data sources as SQL, Excel, XML, and others, and produces many outputs as PDF, XML, and application specific files for later off-line visualization of reports.

JMagallanes - Dynamic Reports in Java

Technical analysis library with indicators like ADX, MACD, RSI, Stochastic, TRIX... This is not an end-user GUI trading or charting application. It is instead targeted to application developers using either Excel, .NET, Mono, Java, Perl, Python or C/C++.

TA-Lib- Technical Analysis Library

JQuantLib is a comprehensive framework for quantitative finance, written in 100% Java. It provides "quants" and Java application developers several mathematical and statistical tools needed for the valuation of shares, options, futures, swaps, and other financial instruments. JQuantLib is based on QuantLib, a well known open-source library for quantitative finance, written in C++. JQuantLib aims to be a complete rewrite of QuantLib, offering features Java developers expect to find. It aims to be fast, correct, strongly typed, well-documented, and user-friendly.

JQuantLib - Comprehensive framework for quantitative finance

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