Open-source alternatives to React Email Editor

Heml is a framework providing a custom markup language and compiler designed to generate responsive HTML and CSS for consistent rendering across email clients. It functions as a system for transforming specialized markup strings into deliverable email templates and associated metadata. The project features a component system for defining reusable custom elements and style rules to standardize design patterns. It includes a responsive layout engine that converts flexible grid structures, columns, and rows into compatible fixed-width tables and fluid layouts. The toolset covers email metadata

Webstudio is a visual CMS and website builder that provides a visual development environment for designing and publishing websites. It functions as an AI-powered design tool, a REST and GraphQL API client, and an atomic CSS compiler. The platform distinguishes itself through generative AI capabilities for creating layout variants and refining visual styles from text prompts. It integrates a headless CMS workflow that maps external data sources to visual components and utilizes a specialized compiler to convert design tokens into deduplicated atomic CSS for optimized page load speeds. The sys

Elementor is a visual page builder for WordPress that provides a drag-and-drop interface for creating responsive layouts and custom themes. It functions as a comprehensive design system manager and theme builder, allowing for the creation of global website components such as headers, footers, and archive pages without writing code. The platform distinguishes itself through a dedicated popup builder with custom trigger conditions and a visual landing page creator that utilizes pre-made kits. It includes a global style registry to synchronize fonts and colors across all site elements and a widg

Brick Design is a low-code page builder framework used to create drag-and-drop visual editors that generate production-ready layout and styling code for user interfaces. It functions as a visual layout engine and UI component orchestrator, providing the tools necessary to manage component constraints, nesting rules, and visual property configurations. The framework includes a dynamic template generator that utilizes logic rendering and expression variables to create reusable, data-driven page templates. It also operates as a multi-device design tool, offering viewport switching and adaptive s

Craft.js is a framework for building extensible drag-and-drop page editors using React components and serializable state management. It provides the core infrastructure to construct custom page builders where users can compose layouts by dragging, dropping, and repositioning elements within a structured editor environment. The framework manages editor state through a component-based node tree, where each user element is represented as an internal node storing its type, props, and parent relationships. This state is managed via React Context and can be serialized to JSON for persistence and sh

Gods-pen is a Vue.js visual page builder and no-code landing page platform for creating responsive mobile marketing pages. It functions as a dockerized content management system and an extensible component framework, enabling the design and publishing of pages with integrated form collection and analytics tracking. The platform features a component marketplace manager for uploading, downloading, and monetizing reusable UI elements across different projects. It provides a comprehensive system for custom component development, utilizing a scaffolding system and schema-driven property mapping to

Twill is a Laravel CMS toolkit and admin panel generator designed for building custom administrative consoles and content management systems. It serves as a headless CMS framework and a toolkit for defining content models and managing structured data through a dedicated administrative interface. The project features a visual block editor that allows publishers to arrange and configure reusable content sections via a drag-and-drop interface. It includes a dedicated digital asset manager for storing, cropping, and optimizing images and files across local or cloud storage, as well as a multiling

BlockNote is a block-based rich text editor and a real-time collaborative workspace. It uses a JSON-based data model to organize content into draggable, nestable blocks rather than a single flat document. The system functions as a high-level interface built on ProseMirror that abstracts document state into discrete, manipulatable content blocks. The project serves as a framework for integrating large language models into document editors, enabling context-aware text generation and AI-driven workflows. It also acts as a document export engine capable of converting structured block data into fo

Builder is a visual content management system and design-to-code tool that transforms visual layouts into functional code for frontend frameworks. It operates as a headless visual editor, allowing for the creation and modification of site layouts through a drag-and-drop interface. The system enables the conversion of design mockups into components for React, Vue, Svelte, and Qwik applications. It decouples layout and design management from the frontend rendering engine, allowing users to update and publish content changes to live applications without redeploying the entire codebase. The plat

Manta is a local-first financial tracker and PDF invoice generator that utilizes a schema-driven form builder to capture and validate structured user information. It serves as a system for managing billing records and invoice statuses directly on the user device to ensure data privacy and offline access. The project features a drag-and-drop document editor and a PDF template management system, allowing users to arrange fields and apply corporate branding without writing code. These tools enable the creation of professional billing documents by injecting structured data into reusable layout sk

Fomantic-UI is a component-based CSS library and frontend design system used to build consistent, responsive user interfaces. It functions as a CSS framework and responsive UI toolkit, providing a structured approach to managing typography, color palettes, and spacing. The project enables the development of custom UI components and the implementation of unified design systems across web applications. It provides a variable-driven theme compilation process to customize visual styles and a build-time system to compile selected components into production CSS bundles. The toolkit covers a broad

Gutenberg is a block-based content management system editor for WordPress. It serves as a modular page builder and React-based content editor where website pages and posts are composed of discrete, reusable blocks rather than a single text area. The system enables visual content authoring through a modular interface used to arrange layout and media. It supports WordPress block development, allowing for the creation of custom modular elements and the extension of editor functionality through specialized plugins. The editor provides capabilities for dynamic content management and the creation

This project is a web-based document editor designed for the creation and formatting of professional resumes. It provides an interactive interface where users can organize content through a drag-and-drop system, allowing for the visual arrangement of document sections and immediate feedback on layout changes. The application distinguishes itself by utilizing a component-based composition model that synchronizes the visual representation of the resume with an underlying data structure. It maintains session continuity by persisting user-defined content directly within the browser, removing the

Shiny is a framework for building interactive web applications using R code, eliminating the need for HTML, CSS, or JavaScript. At its core, it provides a reactive programming model that automatically tracks data dependencies and re-executes only the parts of an application that depend on changed inputs. The framework handles server-side UI rendering and maintains persistent WebSocket connections between the browser and server for real-time updates without page reloads. The framework distinguishes itself through deep integration with the R ecosystem, including the ability to embed interactive

This project is a Node.js email templating engine and SMTP delivery framework used for creating, rendering, and sending custom email templates. It provides a comprehensive suite for email orchestration, including a system for dispatching templated messages and a tool for generating custom layouts to standardize outbound messaging. The framework includes a dedicated HTML CSS inliner that converts external stylesheets into inline styles for consistent rendering across different email clients. It also features a multilingual localization tool for translating template text and subject lines, and

Flowbite is a cross-framework UI library and design system built as a collection of pre-styled components and layout blocks using Tailwind CSS utility classes. It functions as a TypeScript UI toolkit and a general web framework for creating responsive websites and applications. The project provides a mirroring Figma design system to allow prototyping of components and variants before they are coded. It distinguishes itself through an AI-driven approach to page generation and the creation of design specifications via a command-line interface. The library covers a wide range of interactive int

Puck is a headless visual CMS and React visual page editor that provides a drag-and-drop interface for designing page layouts and managing content. It functions as a JSON-based content management system, storing page structures as JSON and exposing them via API for dynamic rendering within applications. The project enables dynamic route authoring by mapping visual editor instances to specific URL paths, allowing content editing for any page. It integrates a visual authoring layer into existing applications to facilitate the design of page structures using custom React components. The system

go-admin is a framework for generating administrative interfaces and data visualization dashboards using the Go programming language. It functions as a low-code dashboard builder and a web-based interface for performing create, read, update, and delete operations across multiple SQL database dialects. The project features a deployment model that compiles backend logic and frontend assets into a single executable binary for simplified distribution. It includes a role-based access control system to manage user permissions and restrict administrative functions based on assigned roles. The frame

QuestPDF is a C# PDF generation library and layout engine used to create structured documents, reports, and invoices. It utilizes a fluent API and a component-based layout approach to convert code into high-fidelity PDF and XPS files. The library distinguishes itself with a dedicated layout debugger that provides real-time previews, hot-reload capabilities, and visual boundary tools to map rendered elements back to source code. It also functions as an accessibility tool, providing semantic tagging and navigational aids to ensure documents comply with international accessibility and archival s

This project is a JavaScript UI component library and frontend utility toolkit. It serves as a web modal framework and popup library, providing a specialized system for rendering interactive dialogs, overlays, and layered interfaces over web page content. The library is distinguished by its comprehensive set of overlay tools, including alert dialogs, confirmation prompts, and the ability to embed external content via iframes. It also features a responsive twelve-column grid system for cross-device layout compatibility and an internal modular dependency management system for on-demand loading

Wagtail is an open-source content management system built on the Django web framework. It provides a structured, tree-based approach to content modeling, allowing developers to define custom page types and reusable content components that are managed through a highly customizable administrative interface. The platform distinguishes itself through its flexible, block-based content composition system, which enables editors to assemble complex page layouts dynamically. It also offers robust support for multi-site and multi-lingual environments, allowing organizations to manage distinct websites

Vizro is a low-code Python framework for building production-ready data visualization applications. It functions as a UI orchestrator that allows users to define multi-page analytical dashboards through structured configurations in Python, YAML, or JSON, reducing the need for extensive frontend engineering. The project distinguishes itself through generative AI integration, utilizing a model context protocol server to translate natural language descriptions into validated dashboard configurations, charts, and layouts. It also features a decoupled data cataloging system that separates data sou

This project is an HTML email framework and compiler designed to build responsive emails using a high-level syntax that transforms into table-based layouts. It functions as an HTML-to-table compiler and CSS inliner, ensuring that simplified markup is converted into the complex nested structures and inline attributes required for cross-client compatibility. The framework features a responsive email grid system and Sass-based styling, allowing the use of variables to manage colors, typography, and spacing. These tools enable custom brand theming and the creation of fluid layouts that adapt to v

Vuesax is a frontend framework and UI component library for Vue.js applications. It provides a customizable design system and a set of pre-styled user interface elements designed to accelerate the development of web interfaces. The project is distinguished by a themeable visual toolkit that supports dynamic color updates and server-side style customization to maintain brand identity. It also features a specialized data table component with built-in support for inline cell editing and server-side processing for pagination, filtering, and sorting. The library covers a broad surface of UI capab

Platform is a framework for building back-office applications and administrative dashboards using Laravel. It functions as a schema-driven UI framework and CRUD generator that automatically constructs database management interfaces, input forms, and validation rules from programmatic model definitions. The project distinguishes itself through a comprehensive backend UI kit that supports advanced data capture, including geographic coordinate mapping, tabular JSON data matrices, and marketing metadata tracking. It features a robust role-based access control system for managing resource visibili

gluestack-ui is a cross-platform React component library built with Tailwind CSS. It provides over 30 pre-built, accessible components that can be installed by copying their source files directly into a project, giving developers full control over customization without external runtime dependencies. Every component implements WAI-ARIA patterns, keyboard navigation, and screen reader support out of the box. A key differentiator is the copy-paste architecture: rather than a traditional package dependency, component source code is placed in the project, allowing direct editing and eliminating ve

Payload is a headless content management system and application framework that uses a code-first approach to define data schemas and administrative interfaces. By utilizing a centralized, type-safe configuration object, it automatically generates database schemas, API endpoints, and a fully customizable admin panel. The system is built on a database-agnostic architecture, allowing it to interface with various storage engines while providing a unified, type-safe API for server-side operations, REST, and GraphQL. What distinguishes Payload is its deep extensibility and developer-centric design.