The Khmer OS project was the pioneer for open-source Khmer fonts. They are widely used in Cambodia.
If you are running a modern version of macOS (Monterey, Ventura, Sonoma, or Sequoia), the experience is excellent. Apple has done a great job integrating Khmer Unicode support natively. However, for designers or users needing specific legacy fonts, the installation process is standard but requires attention to detail to avoid font conflicts.
: Drag and drop multiple font files directly into the Font Book window . 3. Setup the Khmer Keyboard Layout