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: over 3 years ago
Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Designer Mill - Collection of Best Free Design Resources
Tella - Capture your best work with video. Record in the browser, share instantly.
Interfacer - Collection of more than 200+ free design resources
ilos - ilos is a video capture, screen recording, hosting, analytics, and closed captioning inside one app.
Freebiesbug - Collection of the best free web design resources.