Luc Maisonobe

Commons Math is a library of lightweight, self-contained mathematics and statistics components addressing the most common problems not available in the Java programming language or Commons Lang. It provides implementations of major mathematical algorithms concerning statistics, linear algebra ... [More] , differential equations, optimization, root finding ... [Less]

Nabla is an algorithmic differentiator for mathematical functions. Just like the mathematical Nabla operator transforms a function into its differential, the Nabla library transforms an existing java object implementing a function double f(double) { ... } into another java object that in ... [More] addition to computing the value of f like the original one also computes its derivative. The created object is built by applying the classical exact differentiation rules to the function underlying expressions. There are no approximations and no step sizes. Nabla uses bytecode transformation to create the differentiated class and instances [Less]

Orekit is a free low level space dynamics library written in Java. It provides basic elements (orbits, dates, attitude, frames ...) and various algorithms to handle them (conversions, analytical and numerical propagation, pointing ...).