JScience Java library for scientific computations
Java programmers who happen to do “real world” scientific work should check out JScience. Their vision, according to the website is:
To provide the most comprehensive JavaTM library for the scientific community.
To create synergy between all sciences (e.g. math, physics, sociology, biology, astronomy, economics, etc.) by integrating them into a single architecture.
To provide the best on-line services (webstart) for scientific calculations and visualizations.