OpenTAU is a physics simulation package written in Java. It is intended for scientifical application as it incorporates FEM, FDM and MD and other simulation techniques. Also contains a fast math library.
This is a collection of utilities and other nifty code items developed by Thought River for use in internal projects, and made available here for public use.
Better than NASA--avoid sending *your* Mars probe off to empty space! SafeUnits is a Java-based project providing measurement-related classes whose instances, when exported, can only be imported to classes of matching types.
NASA, just a friendly jibe
ODE for Java is a binding between C dynamics library ODE (Open Dynamics Engine, http://ode.org) and Java. Separate packages provide among other things a Java3D integration and thus a scenegraph representation of selected ODE objects.
Java Math Library (JML) is a fairly robust mathematics library that can be used for anything from basic calculations to some more advanced mathematical functions.
This Javalibrary (currently 217 classes) is able to handle quantities in terms of basic arithmetics, conversion to similar units, serialization. As framework it allows to create new dimensions and units by inheritance.
JRVFSim (Jarvis) is a simulator of a fluid dynamics phenomenon known as radial viscous fingering. Its main feature consists of taking jordan curves and simulating their evolution subject to various parameters. Includes a partial API for numerical methods
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A self-sufficient java framework for numerical solution of ODEs (diff eqs) and visualization. Samples are aeronautics/astronautics/physics/rocketry themed. Focus on clean design, modularity, reusability and documentation. Educational project.