addLEDs is a tiny systray indicator that provides at-a-glance views for scroll, number, caps lock and more.

This utility goes a little further than some other key indicators; it also provides flashing lights for network (there are five sensitivity levels that can be set for network activity) and disk activity as well as the ability to engage/disengage your scroll/number/caps via your mouse. Having the ability to engage and disengage those input keys can be useful if your keyboards have burned out or it the actual key is broken allowing you to continue working without immediately replacing the keyboard.

You can mildly customize the indicators with different colors as well as make them transparent.