Based on our record, Facebook Design Resources should be more popular than CapsLock Indicator. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Spotify isn't doing anything unique here, and it's not really a marketing campaign to explain away their UI. It's more of a showcase for hiring professionals, developers/designers/etc. Facebook has a similar one -> https://design.facebook.com/. Source: almost 3 years ago
Also, read anything published by Design @ Facebook. Source: over 3 years ago
Never even thought of an on screen indicator, but I Just found this one that looks promising - https://cli.jonaskohl.de/. Source: about 1 year ago
Designer Mill - Collection of Best Free Design Resources
TrayStatus - Do you have a notebook or keyboard without a NumLock or CapsLock indicator light? Do you have a computer without a hard drive activity light? If so, then TrayStatus is for you.
Interfacer - Collection of more than 200+ free design resources
Keyboard Notifier - Title: Keyboard Notifier Description: 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 …
Freebiesbug - Collection of the best free web design resources.
Keyboard LEDs - Indicators for Caps Lock, and Num Lock.