For caps/num/scroll lock? Easy! I've used https://keyboard-leds.com before, which sits in the system tray, though I don't bother any more. Source: over 1 year ago

In the past, I've used a program to display the traditional keyboard key states, but in the end, I find it's just not necessary. Ideally, none of them should ever change and preventing them from being accidentally toggled is pretty easy. Source: over 1 year ago

Something like Windows https://keyboard-leds.com/. Source: almost 2 years ago

Windows: https://keyboard-leds.com/ Linux: It seems a lot of apps that give notification in the panel. Please Let me know if there's some big on screen popup similar to that app above which is only is visible when CAPS is active. Source: over 2 years ago

I wonder how many implementations there were of that sort of thing. I wrote one for an HP flatbed plotter sometime in the 80s to digitize plots from papers, but I never heard of another. I don't remember the implementation, but it must have been cheaper hardware than the one shown, and only had a plastic lens as the sight. (Nowadays you have http://markummitchell.github.io/engauge-digitizer for instance.) I... - Source: Hacker News / about 3 years ago

Nice, I've used Engauge Digitizer in the past http://markummitchell.github.io/engauge-digitizer/. - Source: Hacker News / over 3 years ago