Hammerspoon

Hammerspoon is a powerful, open-source automation tool for macOS that lets you script window management, keyboard shortcuts, and more in Lua. Despite a modest 48 points and 19 comments on Hacker News, its utility is outsized, enabling custom solutions that save hours per week. For instance, you can create a hotkey to snap windows to 50% of the screen, a feature slower than the average built-in macOS tool without third-party apps. Hammerspoon's strength lies in its flexibility, not its viral score.