Based on our record, Facebook Design Resources seems to be more popular. 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: about 3 years ago
OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
Interfacer - Collection of more than 200+ free design resources
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Designer Mill - Collection of Best Free Design Resources
BandiCam - Bandicam is a screen recording platform built to accommodate the needs of a wide variety of different users.
Freebiesbug - Collection of the best free web design resources.