Several SaaS companies have published their design systems publicly, which gives smaller teams something concrete to learn from. These examples vary by scale and industry, but they share a few things: thorough documentation, solid component libraries, and foundations that hold up as products grow.

Salesforce Lightning Design System is one of the most complete design systems ever published. Built for the Salesforce CRM platform, it covers components, icons, utility classes, and accessibility documentation at a depth most teams never reach. If you're building for enterprise B2B, this is the obvious reference point.

Atlassian Design System powers Jira, Confluence, and Trello. What makes it worth studying is the design token architecture, which handles theming across different Atlassian products and third-party apps. The documentation on typography, color, and spacing is unusually detailed.

Shopify Polaris sits behind the Shopify merchant admin. Its strongest section, honestly, is content guidelines and UX writing standards. Most design systems treat language as an afterthought. Polaris treats it as seriously as component design.

GitHub Primer is one of the more technically mature systems available. It uses semantic and functional token layers, supports multiple color modes including dark mode, and ships both CSS and React implementations. Open source, so you can dig into how it actually works.

HubSpot Canvas is worth looking at specifically if you're dealing with a multi-product setup. HubSpot uses one system across marketing, sales, and service software, which is a real stress test for how far a shared foundation can stretch.

Intercom's design system gets referenced often for its empty state patterns and conversational UI components. It's tightly connected to what the product actually does, which is a good reminder that the best design systems reflect the product's personality, not just its interface.

Looking across all of these, a few patterns come up repeatedly: token-first architecture, serious accessibility coverage, documentation that stays current, and clear ownership models. None of them were built in a quarter.