JAMA is a basic linear algebra package for Java. It provides user-level classes for constructing and manipulating real, dense matrices.

A fast and easy to use dense matrix linear algebra library written in Java.

A comprehensive collection of matrix data structures, linear solvers, least squares methods, eigenvalue, and singular value decompositions.

A fast and easy to use dense and sparse matrix linear algebra library written in Java.

The Apache Commons Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.

A (Strict)FastMath class with 1e-15ish accuracy.

The Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.

Alternate implementations of JDK's "Math" functions.

Java OpenGL Math Library

The Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.