Checklist Design - A collection of the best design practices.
Typescale - Create stunning typography, generate CSS, and find inspiration.
The branding style guidelines documents archive
wordmark.it helps you choose fonts
Fonts In Use – Type at work in the real world.
Eva Design System: Deep learning color generator
Free Mockups — Mr.Mockup | Graphic Design Freebies
Free Premium Mockups - Instant Download - Mockups-Design.com
Tailwind CSS Color Generator | UI Colors
Happy Hues - Curated colors in context.