Midnight Keyboard
The only macOS utility that dims the keyboard backlight below the minimum setting. Free download with a 3-night trial, then a one-time $7 unlock.
All of my macOS apps:
Stickypoint
Built for low-vision users to improve the usability of the trackpad in macOS. The pointer is always on a button, link or field; push the trackpad and it jumps to the next one. Think Apple TV's swiping UI but for everything in macOS.
Grainer
Enables the iPhone 18 Pro's Texture photo styles, Soft Skin, Glow and Film, on HEIC photos from any iPhone running iOS 27.