Java libraries for scientific calculations
From the page: "Our Vision
* 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."
It seems really cool and very useful when you deal numbers in a serious way...