To learn more see http://www.jurikres.com/freebies1/TS_jma_dwma_macd.htm.
A list of Paid indicators:
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.