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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 shares, options, futures, swaps, and other financial instruments, also providing tools related to risk management and money management.

It's is a 100% Java framework based on QuantLib, which is written in C++. JQuantLib is not a mere translation of the C++ thing, but a complete rewrite intended to offer features that Java developers expect. JQuantLib aims to be fast, correct, strongly typed, well-documented, and user-friendly. Read full story...