Money Flow Index (MFI)

Interpretation / Algorithm
Description with math formula [FMLabs.com]
Technical Analysis A to Z by Steven B. Achelis [equis.com]
Technical Analysis Studies [prophet.net]

Product Implementation	Function / Formula / Script / Source Code
Genius Trader [geniustrader.org]	PERL Script - GT::Indicators::MFI [geniustrader.org]
TA-Lib [ta-lib.org]	C/C++ Source Code - TA_MFI()
Wealth-Lab [wealth-lab.com]	ChartScripts using MFI [wealth-lab.com]

Related Links
The Basics of Money Flow by Shaun Taylor [investopedia.com]