Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
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
GIMP - GIMP is a multiplatform photo manipulation tool.
Designer Mill - Collection of Best Free Design Resources
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Interfacer - Collection of more than 200+ free design resources
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Freebiesbug - Collection of the best free web design resources.