Paid
A guide to designing beautiful user interfaces in the form of a book, in-depth video tutorials along with a component inspiration gallery, comprehensive colour palettes, a curated font showcase and an exclusive icon library.
https://www.refactoringui.com/
Free
Mobbin is a massive library of 100,000+ fully searchable mobile & web screenshots for UX Research
https://mobbin.com/browse/ios/apps?via=ansh
Free
Design Vault is an ever-growing collection of design inspiration that showcases designs from actual products, giving you access to the latest UI patterns and trends.
Free
Screenlane is a website and newsletter that features the latest mobile UI designs for design inspiration.
https://screenlane.com/?ref=uimovement
Free
UXUI Monster is a daily updated library of handpicked new websites from creative agencies and web designers all over the world.