JQuantLib is a free, open-source, comprehensive framework for quantitative finance, written in Java. It provides "quants" and Java application developers several mathematical and statistical tools needed for the valuation of financial instruments, among other features.

Quokka is a software build system, focusing on reproducible, modular builds with fine-grained dependency management. Quokka is implemented using Java and initially focuses on supporting Java-based projects and tools.

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Frankenstein is a Functional Testing tool for Swing applications. Frankenstein's focus is on readable, simple, fast functional tests that can be shared and run by everyone on a team. Apart from automating your functional tests, you could also use Frankenstein for recording bugs so that they may be easily reproduced later.

The Bean Builder is a visual programming environment that demonstrates the assembly of applications by joining live instances of JavaBeans.

XMLTool is a very simple Java library to be able to do all sorts of common operations with an XML document. As a Java developer, I often end up writing the always the same code for processing XML, transforming, ... So i decided to put all in a very easy to use class using the Fluent Interface pattern to facilitate XML manipulations

hace unas semanas que jugamos un poco con el framework -sabrán qu

The Panopticode project provides a set of open source tools for gathering, correlating, and displaying code metrics