nShiftSpace

nShiftSpace (Nexa ShiftSpace) is an ultra-lightweight Windows tray utility that toggles the Korean/English IME with Shift+Space — the classic Korean keyboard layout behavior. Single ~5KB executable built with pure Win32 API and no C runtime; zero CPU while idle, about 0.1MB in Task Manager. The tray menu has a "Start at login" toggle (HKCU Run value, written only when you turn it on) and Exit. A keyboard-LED variant is available as a separate zip on the GitHub Releases page.