Open-source alternatives to DisplayFusion
Monitor brightness and settings4

MonitorControl is a free app for Mac computers that lets you change the brightness, volume and contrast of external monitors from the Mac itself. It is for everyday Mac users who want to control a separate monitor with their keyboard or a menu bar slider.
Has 3 of 5
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does the whole job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.

Twinkle Tray is a Windows app that adds a brightness control to the system tray so you can adjust external monitors from your computer. It is for Windows 10 and 11 users who want to change brightness on several screens at once.
Has 3 of 5 · Volume and input switching ✗
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does part of the job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.

Monitorian is a free Windows tool that lets you change the brightness of one or several monitors from a single place on your computer. It is for Windows users who have external monitors and want to adjust them without using the buttons on each screen.
Has 2 of 5
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does part of the job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.
ddcutil is a Linux command-line program that reads and changes settings on external monitors, such as brightness, color levels and input source, from the computer. It is for Linux users and system administrators comfortable with a terminal.
Has 0 of 5 · No commands needed ✗
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does part of the job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.
Window snapping and tiling4

Rectangle is a free app for Mac computers that arranges open windows by snapping them to the edges of the screen or to keyboard shortcuts. It is for everyday Mac users who want their windows organized without manual resizing.
Has 3 of 7 · Runs on Windows ✗ +1
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does the whole job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.
PowerToys PowerRename is one of over 30 free utilities bundled in Microsoft PowerToys, a set of add-ons that customize Windows. It is for Windows users who want to rename many files at once.
Has 1 of 7 · Runs on Mac ✗
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does the whole job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.
GlazeWM is a free program for Windows that automatically arranges open windows into neat tiles, controlled mostly with keyboard shortcuts. It is aimed at people who want to organize their screen quickly without using the mouse.
Has 2 of 7 · Runs on Mac ✗ +1
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does part of the job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.
AeroSpace is a free tool for Mac computers that automatically arranges open windows into tiles, controlled mainly with the keyboard. It is aimed at advanced users and programmers who want to manage windows without using the mouse.
Has 3 of 7 · Runs on Windows ✗ +1
How many people bookmarked its code on GitHub. It shows how popular it is, not how good it is or how well it replaces the app.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
Its code changed within the last year, so someone is still looking after it.
Does part of the job.
Ordered by how fully it replaces the app, Verified, setup and, when there are enough, people's votes.