话不多说，直接上干货。由于大多数是国外网站，访问和下载速度你懂的。
1. Apple UI Design Resources
下载地址：Design Resources – Apple Developer
2. Google Material Design
下载地址：Sticker sheets & icons – Resources – Material Design
3. Ant Design 蚂蚁金服
下载地址：A UI Design Language
4. Salesforce Lightning Design System
下载地址：Downloads – Lightning Design System
5. GE Predix Design System
下载地址：Predix Design System
6. Shopify Polaris
下载地址：Resources – Shopify Polaris
7. VMware Clarity
下载地址：https://vmware.github.io/clarity/news
8. Nutanix Design System
下载地址：Nutanix UI Visual Guideline 2.0
9. IBM Carbon
下载地址：Carbon Design System
10. Priceline Design System
下载地址：Priceline One Design System
11. Microsoft Fluent Design System
下载地址：Design Universal Windows Platform (UWP) apps
12. U.S. Web Design System
下载地址：https://designsystem.digital.gov/getting-started/designers/
13. Element 饿了么
下载地址：Element
14. MongoDB Design
下载地址：MongoDB Design
15. Audi
下载地址：User Interface / UI Introduction
16. Hewlett Packard Grommet
下载地址：Grommet
17. macOS UI Library (非官方，由 Sketch 团队维护)
下载地址：macOS UI Library
18. Mand Mobile 滴滴
下载地址：Mand Mobile
19. Auth0 Cosmos
下载地址：Cosmos – Auth0 Design System
20. WeUI 微信
下载地址：weui/weui-design
