Sake
Sake is a PHP implementation of Polynomial Least Squares Regression. The algorithm takes data points as input and returns the resulting polynomial.
Graphs can be made using any plotting package. Sake provides the polynomial and will compute as many points as desired.
Source Forge Project: https://sourceforge.net/projects/sake/
Developer Guide :http://sake.sourceforge.net/devGuide/
API Documentation: http://sake.sourceforge.net/sakeApi/
Source Repository: http://sake.svn.sourceforge.net/svnroot/sake/trunk/
Downloads: https://sourceforge.net/project/showfiles.php?group_id=243341
Special thanks to Source Forge for hosting the Sake project!