JQuantLib is a free, open-source and comprehensive framework for quantitative finance, written in Java.
It provides quants and Java application developers several mathematical and statistical tools
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needed for price valuation of financial instruments such as futures, options, bonds, swaps, commodity futures, etc employing a wide range of algorithms and methods. It also offers support for risk valuation.
JQuantLib is a 100% Java framework based on QuantLib, which is written in C++. JQuantLib is not simply a mere translation from C++ to Java, but it's a rewrite intended to offer what Java developers expect to have. JQuantLib aims to be correct, pretty well documented, strongly type-checked and surprisingly fast.
Richard Gomes
http://www.jquantlib.org/index.php/User:RichardGomes [Less]