Box Breakout Alert (MT4, MT5) — this indicator will notify you when the price breaks out of some previous high/low range.

Bollinger Bands Breakout Alert (MT4, MT5) — a class Bollinger bands indicator with breakout alerts options.

Alligator with Alert (MT4, MT5) — a classic Alligator (Bill Williams) indicator with all kinds of alerts added to it.

ZigZagOnParabolic (MT4, MT5) — improved version of the standard MetaTrader ZigZag indicator that is based on another MetaTrader standard indicator — Parabolic SAR. Detects chart extrema.

WRB Hidden Gap (MT4, MT5) — an indicator that can help price action traders to find the wide range bars and wide range candlestick bodies, and hidden gaps. It offers no trading signals on its own, but it can help trading using external entry signals.