addLEDs is described as 'AddLEDs displays the state of the Caps Lock, Num Lock and Scroll Lock keys and provides information on network and disc activity with the help of icons' and is an app in the OS & Utilities category. There are more than 10 alternatives to addLEDs for Windows. The best alternative is CapsLock Indicator, which is both free and Open Source. Other great apps like addLEDs are Keyboard LEDs (Free), TrayStatus (Freemium), KbLeds (Free) and Keyboard Notifier (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.
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.
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.