Keyboard Lights is described as 'Some of the latest keyboard and notebook models no longer have indicators for the status of the Caps Lock, Num Lock and Scroll Lock keys, and some people prefer not to have to look away from their monitors even if their input devices are equipped with these indicators'. There are more than 10 alternatives to Keyboard Lights for Windows. The best alternative is CapsLock Indicator, which is both free and Open Source. Other great apps like Keyboard Lights are Keyboard LEDs (Free), TrayStatus (Freemium), KbLeds (Free) and addLEDs (Free).
Keyboard Notifier sits in the system tray and notifies the user as to the state of the Caps, Scroll and Num lock keys. Designed for systems with ill-placed or non-existent hardware notification lights.
A simple customizable key lock indicator application with the following features: On-Screen display when key lock changes, System Tray indicator icons, optional Integration with Logitech G Hub to lighting up lock keys depending on lock state.