FlowMapp is a UX planning tool for creating visual sitemaps and user flow. FlowMapp is very effective for planning the development of a site, mobile or web app, and it allows all the participants in the process to collaborate with each other, which makes the workflow easier and more convenient.
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
VisualSitemaps - Autogenerate visual sitemaps in seconds.
Designer Mill - Collection of Best Free Design Resources
Rarchy - Plan your next website with Rarchy using our easy visual sitemaps & website planning tool. Collaborate in real-time with your whole team. Try us for free today!
Interfacer - Collection of more than 200+ free design resources
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
Freebiesbug - Collection of the best free web design resources.