Fast and improved BigDecimal class. [Commercial/Free]

An equation solving library that finds solutions to equation sets. A set of equations can be passed in as text, while AutoAbacus attempts to find a solution that satisfies all constraints. [Commercial, trial version]

Improved BigDecimal class from IBM. [Open source]

High performance scientific and technical computing data structures and methods. (Open Source, Attribution)

A light-weighted (re)implementation of the Java Expression Parser (jep.sourceforge.net). The intention is to strip some of its not-so-often-used features, and thus speeding the rest. Includes expression optimizer. [Open source, GPL]

A class library that provides mathematical graph-theory objects and algorithms. JGraphT supports a rich gallery of graphs and is designed to be powerful, extensible and easy to use. [Open source, LGPL]

Working group that offers presentation, news, and libraries related to numerical computing.

Parses and computes expressions or functions primarily for use in spreadsheet applications such as the example provided. [Beta Evaluation]

Java classes for parsing and evaluating mathematical expressions. Supports multiple variables and user-defined functions. [Open source, GPL or commercial]

A Java library for evaluating mathematical expression. It is compatible with the JDK 1.1 and later. [Shareware]