Data Sources and Algorithms
St. Louis Federal Reserve FRED Database
This site has well over 500 thousand data series.
U.S. Energy Information Administration
This site has well over 300 thousand data series
Scripps Institution of Oceanography
Keeling Curve data on CO2 emissions.
Apache Commons Math
Some good and free math/statistics algorithms here.
Other Contributions
Java, JFreeChart annd QSOpt for linear programming.
Display their FAQs
Customers have questions, you have answers. Display the most frequently asked questions, so everybody benefits.