The Schaff Trend Cycle was discovered by Doug Schaff and is used to identify cycles within the market. Relatively new, having been discovered in 2008, the STC represents overbought/oversold market conditions and is known to be leading, compared to the MACD to identify potential changes in cycles within a trend.
The Williams Percent Range indicator or %R is a momentum oscillator and works similar to Stochastics, with a small difference and is considered as a leading indicator. The %Range indicator does not have the smoothing factor which can be seen with Stochastics oscillator.
The Average True Range is a technical analysis indicator, developed by J. Welles Wilder. It is used to measure market volatility and works as an oscillator. The ATR is calculated based on the price’s true range (the high and the low prices) and represents market noise.