Recharts is a Redefined chart library built with React and D3. It can be easily deployed with React components. It has SVG support, lightweight depending only on some D3 submodules. All the components of Recharts are clearly separated.

Recharts - Redefined chart library built with React and D3

React components for efficiently rendering large, scrollable lists and tabular data.

React Virtualized - React components for efficiently rendering large lists and tabular data

Slate is a  completely customizable framework for building rich text editors. Slate lets you build rich, intuitive editors like those in Medium, Dropbox Paper or Google Docs—which are becoming table stakes for applications on the web—without your codebase getting mired in complexity. It can do this because all of its logic is implemented with a series of plugins, so you aren't ever constrained by what is or isn't in "core". You can think of it like a pluggable implementation of contenteditable built on top of React. It was inspired by libraries like Draft.js, Prosemirror and Quill.

Slate is a completely customizable framework for building rich text editors. Slate lets you build rich, intuitive editors like those in Medium, Dropbox Paper or Google Docs—which are becoming table stakes for applications on the web—without your codebase getting mired in complexity. It can do this because all of its logic is implemented with a series of plugins, so you aren't ever constrained by what is or isn't in "core". You can think of it like a pluggable implementation of contenteditable built on top of React. It was inspired by libraries like Draft.js, Prosemirror and Quill.

Slate - A completely customizable framework for building rich text editors

Manage Firestore data in a spreadsheet-like UI, write Cloud Functions effortlessly in the browser, and connect to your favorite third party platforms such as SendGrid, Twilio, Algolia, Slack and more. It supports CRUD operations, Sort and filter by row values, Lock, Freeze, Resize, Hide and Rename columns, Multiple views for the same collection, Bulk import or export data - csv, json.

Rowy - Open-source Airtable-like experience for your database (Firestore) with GCP's scalability

FullCalendar is a full-sized drag & drop event calendar. It generates real React virtual DOM nodes so you can leverage Fiber, React's highly optimized rendering engine. It has support for React, Vue, Angular and Javascript.

Fullcalendar - Full-sized drag & drop event calendar

Next.js gives you the best developer experience with all the features you need for production: hybrid static & server rendering, TypeScript support, smart bundling, route pre-fetching, and more. No config needed.
<ul>
<li>Server-rendered by default</li>
<li>Automatic code splitting for faster page loads</li>
<li>Simple client-side routing (page based)</li>
<li>Webpack-based dev environment which supports <a href="https://webpack.js.org/concepts/hot-module-replacement/" target="_blank">Hot Module Replacement</a> (HMR)</li>
<li>Able to implement with Express or any other Node.js HTTP server</li>
<li>Customizable with your own Babel and Webpack configurations</li>
<li>Next.js Analytics collects web vitals from the actual devices your visitors are using. Draw actionable Next.js insights by seeing which pages and source code contribute to your score.</li>
<li>Pre render pages at build time (SSG) or request time (SSR) in a single project.</li>
<li>Add and update statically pre-rendered pages after build time.</li>
</ul>

Next.js gives you the best developer experience with all the features you need for production: hybrid static & server rendering, TypeScript support, smart bundling, route pre-fetching, and more. No config needed.

Next.js - Framework for server-rendered or statically-exported React apps

Reakit helps to build accessible rich web apps with React. It is a lower level component library for building accessible high level UI libraries, design systems and applications with React. It strictly follows WAI-ARIA 1.1 standards and provides many of the widgets described in WAI-ARIA Authoring Practices like Button, Dialog, Tab and others. It  has been built with composition in mind. In fact, its own components are composed by a few other abstract ones, like Role, Tabbable and Composite.

Reakit - Toolkit for building accessible rich web apps with React

A CMS for static site generators. Give non-technical users a simple way to edit and add content to any site built with a static site generator. Netlify CMS is a single-page app that you pull into the /admin part of your site.
 
It presents a clean UI for editing content stored in a Git repository. Content is stored in your Git repository alongside your code for easier versioning, multi-channel publishing, and the option to handle content updates directly in Git. You setup a YAML config to describe the content model of your site, and typically tweak the main layout of the CMS a bit to fit your own site. When a user navigates to /admin they'll be prompted to login, and once authenticated they'll be able to create new content or edit existing content.

A CMS for static site generators. Give non-technical users a simple way to edit and add content to any site built with a static site generator. Netlify CMS is a single-page app that you pull into the /admin part of your site.

Netlify CMS - A Git-based CMS for Static Site Generators 

Gatsby is a blazing fast static site generator for React. Gatsby.js is a static PWA (Progressive Web App) generator. You get code and data splitting out-of-the-box. Gatsby loads only the critical HTML, CSS, data, and JavaScript so your site loads as fast as possible. Once loaded, Gatsby prefetches resources for other pages so clicking around the site feels incredibly fast.
 
It has rich data plugin ecosystem lets you build sites with the data you want — from one or many sources: Pull data from headless CMSs, SaaS services, APIs, databases, your file system & more directly into your pages using GraphQL.

Gatsby is a blazing fast static site generator for React. Gatsby.js is a static PWA (Progressive Web App) generator. You get code and data splitting out-of-the-box. Gatsby loads only the critical HTML, CSS, data, and JavaScript so your site loads as fast as possible. Once loaded, Gatsby prefetches resources for other pages so clicking around the site feels incredibly fast.

Gatsby - Blazing fast static site generator for React

Nx is a next generation build system with first class monorepo support and powerful integrations. Nx builds a project graph by analyzing your workspace, which it then uses to only rebuild what is necessary and to never run the same computation twice. 
 
Nx comes with an interactive dependency diagram to help explore and understand your workspace. It provides a modern integrated dev experience. It has a high-quality VS Code plugin, interactive visualizations, GitHub integration and more.

Nx is a next generation build system with first class monorepo support and powerful integrations. Nx builds a project graph by analyzing your workspace, which it then uses to only rebuild what is necessary and to never run the same computation twice. 

Nx - Smart, Fast and Extensible Build System

Mantine is a fully featured React components library includes more than 120 customizable components and 40+ hooks to manage state and UI management. Mantine core library includes all essential components: inputs, buttons, modals, popovers, typography elements, layout management, etc. 
 
Its package includes:
<ul>
<li><code>@mantine/hooks</code> – collection of 40+ hooks for state and UI management</li>
<li><a href="https://mantine.dev/theming/create-styles/" rel="nofollow"><code>@mantine/styles</code></a> – <a href="https://emotion.sh/" rel="nofollow">emotion</a> based css-in-js library that is used in all Mantine components</li>
<li><code>@mantine/core</code> – core components library – 100+ components, exports everything from <code>@mantine/styles</code></li>
<li><a href="https://mantine.dev/form/use-form/" rel="nofollow"><code>@mantine/form</code></a> – forms management library</li>
<li><a href="https://mantine.dev/others/notifications/" rel="nofollow"><code>@mantine/notifications</code></a> – a fully featured notifications system</li>
<li><a href="https://mantine.dev/others/spotlight/" rel="nofollow"><code>@mantine/spotlight</code></a> – <code>Ctrl + K</code> command center for your application</li>
<li><a href="https://mantine.dev/others/prism/" rel="nofollow"><code>@mantine/prism</code></a> – code highlight built with <a href="https://github.com/FormidableLabs/prism-react-renderer">prism-react-renderer</a></li>
<li><a href="https://mantine.dev/others/rte/" rel="nofollow"><code>@mantine/rte</code></a> – a Quill based rich text editor</li>
<li><a href="https://mantine.dev/others/dropzone/" rel="nofollow"><code>@mantine/dropzone</code></a> – manages files drag 'n' drop to an area or entire screen</li>
<li><a href="https://mantine.dev/others/modals/" rel="nofollow"><code>@mantine/modals</code></a> – centralized modals manager</li>
<li><a href="https://mantine.dev/theming/ssr/" rel="nofollow"><code>@mantine/ssr</code></a> – server side rendering utilities</li>
<li><a href="https://mantine.dev/theming/next/" rel="nofollow"><code>@mantine/next</code></a> – server side rendering utilities for Next.js</li>
<li><a href="https://mantine.dev/theming/gatsby/" rel="nofollow"><code>gatsby-plugin-mantine</code></a> – Gatsby plugin to setup server side rendering</li>
<li><a href="https://www.npmjs.com/package/eslint-config-mantine" rel="nofollow"><code>eslint-config-mantine</code></a> – ESLint and Prettier configuration that is used in all Mantine projects</li>
</ul>

Mantine is a fully featured React components library includes more than 120 customizable components and 40+ hooks to manage state and UI management. Mantine core library includes all essential components: inputs, buttons, modals, popovers, typography elements, layout management, etc. 

Mantine - A fully featured React components library includes more than 120 customizable components and hooks

Ant Design is an enterprise-class UI design language and React UI library. It provides plenty of UI components to enrich your web applications, and we will improve components experience consistently. It supports Server side rendering, Theme customization, Internationalization support and lot more.

Ant Design - An enterprise-class UI design language and React UI library 

PostHog provides open-source product analytics, built for developers. Automate the collection of every event on your website or app, with no need to send data to 3rd parties. It provides event-based analytics at a user level, capture your product's usage data to see which users are doing what in your application. It automatically capture clicks and pageviews to analyze what your users are doing without pushing events manually. PostHog supports session recording to watch videos of your user behavior, with fine-grained privacy controls. It also has plugins to integrate your product usage data with other systems, like your CRM, or data lakes.
Its features include:
<ul>
<li>Event based analytics</li>
<li>User and Group Tracking</li>
<li>Data Visualization</li>
<li>Session Recording</li>
<li>Feature Flag</li>
<li>Heatmap</li>
<li>Correlation analysis</li>
</ul>
If you want to test or play with PostHog, try installing in Linux using Docker
<pre class="language-bash"><code> /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/posthog/posthog/HEAD/bin/deploy-hobby)" </code></pre>
&nbsp;

PostHog provides open-source product analytics, built for developers. Automate the collection of every event on your website or app, with no need to send data to 3rd parties. It provides event-based analytics at a user level, capture your product's usage data to see which users are doing what in your application. It automatically capture clicks and pageviews to analyze what your users are doing without pushing events manually.

PostHog - Product analytics, built for developers

Cezerin is React and Node.js based eCommerce platform. Allows creating a Progressive Web Apps. It feature include list Product details, Product categories, Inventory and stock management, Orders, Pages, Shipping and payment methods, Payment Gateways,  Checkout options, Theme Settings, App store, Server-side rendering (SEO friendly) and lot more.

Cezerin - Ecommerce Progressive Web Apps

Saleor is a rapidly-growing open source e-commerce platform that has served high-volume companies from branches like publishing and apparel since 2012. Based on Python and Django, the latest major update introduces a modular front end powered by a GraphQL API and written with React and TypeScript.
 
<ul>
<li>PWA: End users can shop offline for better sales and shopping experiences</li>
<li>GraphQL API: Access all data from any web or mobile client using the latest technology</li>
<li>Headless commerce: Build mobile apps, customize storefronts and externalize processes</li>
<li>UX and UI: Designed for a user experience that rivals even the top commercial platforms</li>
<li>Dashboard: Administrators have total control of users, processes, and products</li>
<li>Orders: A comprehensive system for orders, dispatch, and refunds</li>
<li>Cart: Advanced payment and tax options, with full control over discounts and promotions</li>
<li>Payments: Flexible API architecture allows integration of any payment method. It comes with Braintree support out of the box.</li>
<li>Geo-adaptive: Automatic localized pricing. Over 20 local languages. Localized checkout experience by country.</li>
<li>SEO: Packed with features that get stores to a wider audience</li>
<li>Cloud: Optimized for deployments using Docker</li>
<li>Analytics: Server-side Google Analytics to report e-commerce metrics without affecting privacy</li>
</ul>

Saleor is a rapidly-growing open source e-commerce platform that has served high-volume companies from branches like publishing and apparel since 2012. Based on Python and Django, the latest major update introduces a modular front end powered by a GraphQL API and written with React and TypeScript.

Saleor Commerce - A headless, GraphQL-first e-commerce platform delivering ultra-fast, dynamic, personalized shopping experiences

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