Jane, I use what StockCharts calls Chaiken Oscillator
Chaikin Oscillator - Combines price and volume to show how money may be flowing into or out of a stock. Based on Accumulation/Distribution Line.
Read about it in the free StockCharts Chart School. The algorithm is somewhat more unique than most indicators in that it is a derivative of a derivative.
I do not know what other chart services offer. I do know that Worden's TC2000 does not offer Chaiken.
StockCharts also has a variation called Chaiken Money Flow (I have not experimented with that one).
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