Open Source Page Builders Projects
Visual drag-and-drop editors and frameworks for building web pages, landing pages, and content layouts without writing code.
Craft.js
React framework for building extensible drag-and-drop page editors. Headless, framework-based approach with full plugin support.
Alternative to: 
Builder.io
Builder.io
Puck
Open-source visual editor for React. Drag-and-drop page builder with a component-based architecture and MIT license.
Alternative to: Builder.io
Builder.io