I've tried to collect them all but TV became so slow, that it was completely unusable.
So i left only those that performs best on various backtest systems.
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.
1) you can speed up a calculation of the script by using standard sma() and ema() functions instead of loops in variant_ema and variant_sma.
2) in variant_zerolagema you should round `(len - 1) / 2` expression, because `len - 1` can be odd number, and whole expression value can be float.