Amethyst vs Forest

Amethyst is a free, open-source tiling window manager for macOS inspired by xmonad. It automatically arranges application windows into non-overlapping layouts using keyboard shortcuts, without requiring System Integrity Protection to be disabled. Amethyst supports multiple layout algorithms including tall, wide, fullscreen, and column layouts.

Forest is a productivity tool that focus timer app that grows virtual trees when you stay off your phone. It offers a paid pricing model.