Apps similar to Brightness Master include Dimly, which is free and open source. Other options are MonitorControl, Monitorian, ddcutil and DDCcontrol. In total there are nine Screen Dimmers like Brightness Master for Mac, Windows and Linux.
Open-source macOS menu utility for unified brightness, blackout, and sleep control of external monitors, using hybrid DDC/CI and software overlays, per-display settings, custom profiles, hotkeys, panic shortcut, privacy by design, and secure signed builds.
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Monitorian is a Windows desktop tool to adjust the brightness of multiple monitors with ease.
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Most monitors, other than laptop displays, have a Virtual Control Panel (VCP), which implements features defined in the Montor Control Command Set (MCCS). Typically, ddcutil communicates with the monitor's VCP over an I2C bus, as per the Display Data Channel/Command...
DDCcontrol is software for controlling monitor parameters such as brightness, contrast, and RGB color levels. It includes a command-line tool and a GUI tool.
iBrightness Tray is a little bit of a swiss army knife display tool as adjusting the brightness of your screen is just one of three main functions it has. The other two are turning on your screensaver at the click of a button and also the ability to turn off the display...
Python monitor control using the VESA Monitor Control Command Set (MCCS) over the Display Data Channel Command Interface Standard (DDC-CI).
Focus view, extra brightness, ambient glow, and keep awake — all from your menu bar. JoyScreen transforms how you use your Mac.
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