eBay Evo is eBay's modernized brand and design system, documented in a 280-page Playbook covering logo, color, typography, icons, and components like form building, bulk editing, and data visualization.
The Playbook is unusually massive and concrete for a public reference, over 2,700 visual examples, 1,116 images, and 108 videos, and accessibility is color-coded directly into each component rather than covered in a separate section.
Designers wanting to see how a major e-commerce marketplace redesigned its entire visual identity and documented the reasoning in extreme, example-driven detail.
It's worth browsing specifically for the sheer volume of real-world visual examples, useful as a model for how thoroughly a rebrand can be documented for internal teams.
eBay's own design system, covering the principles and components behind the eBay experience.