udecode/plate

Plate is an open-source rich-text editor framework for building powerful text editing experiences in web applications. Think of it as a customizable toolkit you add to your own app so users can write and format content, like a Notion-style document editor, complete with features like headings, bullet lists, images, and AI-assisted writing. The editor is a WYSIWYG tool, meaning "What You See Is What You Get": content appears formatted as you type rather than showing raw code. It supports AI features and is built with shadcn/ui, a popular collection of pre-styled interface components, which means the editor can look polished out of the box while still being fully customizable. Plate works with React (a widely used library for building web interfaces) and TypeScript, and is distributed as a set of installable packages via npm (the standard way to add code libraries to JavaScript projects). It offers a plugin system, meaning you can mix and match only the features you need, such as drag-and-drop, markdown support, or AI autocomplete, rather than including everything at once. To get started quickly, the project offers several ready-made templates: a minimal setup, a full-featured playground, and a Notion-like template with a backend included. Documentation is available at platejs.org. It is released under the MIT license, meaning it is free to use in personal or commercial projects.