The best open source alternative to Dimmer is Redshift. If that doesn't suit you, our users have ranked more than 50 alternatives to Dimmer and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Dimmer are Twinkle Tray, LightBulb, Nox Dimmer and RedshiftGUI.
Redshift adjusts the color temperature according to the position of the sun. A different color temperature is set during night and daytime.
Twinkle Tray enables brightness control on external displays in Windows 10 & 11. Even th Windows is capable of adjusting the backlight on most monitors, it doesn't support external monitors natively.
Actually adjusts the brightness of monitors (through DDC/CI)
Background application that adjusts screen gamma, making the colors appear warmer at night, reducing strain on your eyes.
Nox is a modern, lightweight screen dimming utility for Windows designed to reduce eye strain in low-light environments - For external and primary monitors.
RedshiftGUI changes the color temperature of your monitor to better match that of your surrounding. This means that it sets a cooler color temperature during the daytime (due to natural lighting) and sets a warmer temperature at night (due to indoor lighting). Similar to f.
Only changes color not brightness
Monitorian is a Windows desktop tool to adjust the brightness of multiple monitors with ease.
BlinkMoreFree is an open source macOS menu bar application that helps reduce eye strain by fading your screen when you stare at it for too long without blinking. Using automated eye-tracking and customized settings to encourage you to blink more.
Python monitor control using the VESA Monitor Control Command Set (MCCS) over the Display Data Channel Command Interface Standard (DDC-CI).
Windows implementation of the ddcutil Linux program for querying and changing monitor settings, such as brightness and color levels.
BrightIntosh is lightweight, works system-wide, has optional launch-at-login functionality and includes a global hotkey to toggle the extra brightness.
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Only changes color not brightness