Carbon is IBM’s open-source design system for products and experiences. 

Carbon Design System

Spectrum provides components and tools to help product teams work more efficiently, and to make Adobe’s applications more cohesive.

Spectrum

The Popover component displays floating informative and actionable content in relation to a target. Popovers appear either at the top, bottom, left, or right of their target.

Tetrisly is constantly updated with the newest Figma features like variables, auto-layout, properties, nested instances.

Tetrisly

Help designers/developers building beautiful products more flexible and working with happiness.

Ant Design

AlignUI is an advanced design system for Figma that offers comprehensive and high-quality components, as well as customizable dashboards, widgets, and templates tailored for different sectors and purposes.

AlignUI

Frames X is the one Figma design system and Handbook to streamline your workflow, help complete projects faster, and get paid more by managing more clients efficiently.

Frames X

Design UI interfaces and simplify the process of integrating into live websites with Tailwind CSS using this professional Figma design system featuring 1000+ component variants, responsive pages, dark mode, and auto-layout.

Flowbite

Popover

The content displayed inside the popover.

content

isOpen

Whether the popover has a decorative arrow pointing to the trigger.

hasArrow

The position of the popover in relation to its target.

placement

onClose

Callback invoked when the user clicks outside the popover.

onClickOutside

The Base design system defines the foundations of user interfaces across Uber's ecosystem of products & services. It brings all Uber experiences together under a single, unified framework.

Base

Blueprint is an open source project developed at Palantir. A react - based UI toolkit for the web.

Blueprint

Chakra UI is a simple, modular and accessible component library that gives you the building blocks you need to build your React applications.

Chakra UI

The Elastic UI framework (EUI) is a design library in use at Elastic to build internal products that need to share our aesthetics. It distributes UI React components and static assets for use in building web layouts.

Elastic UI

A collection of UX frameworks you can use to build Fluent experiences that fit seamlessly into a broad range of Microsoft products.

Fluent 2

Build fully functional accessible web applications faster than ever – Mantine includes more than 100 customizable components and 50 hooks to cover you in any situation.

Mantine

Material UI is beautiful by design and features a suite of customization options that make it easy to implement your own custom design system.

Material UI

Pajamas is here to make it as comfortable as possible for anyone to contribute towards GitLab. You will find information such as our principles, components, usage guidelines, branding, research methodologies, and more!

Pajamas

Our components are a collection of interface elements that can be reused across the Shopify system.

Polaris

We chose to open-source it to allow the community to design and build their own projects with Primer.

Primer Design System

An open source component library optimized for fast development, easy maintenance, and accessibility. Just import and go—no configuration required.

Radix

Github -  Hover over the user's profile image.