Productivity apps here change how you control the Mac: launchers, keyboard remappers, mouse and scrolling fixes, automation frameworks and time trackers. They hook into input and accessibility APIs, so expect to grant Accessibility or Input Monitoring permission in System Settings on first launch.
Because they need deep system access, many cannot ship through the sandboxed Mac App Store and are distributed directly or via Homebrew. Karabiner-Elements remaps keys at a low level, Hammerspoon automates macOS with Lua scripts, Mos smooths mouse wheel scrolling, Mac Mouse Fix adds gestures to third-party mice, and ActivityWatch tracks where your time goes, storing data locally.