Visual Page Builders

These give end-users (or you) the ability to drag, drop, and configure components into pages — useful for landing-page CMS, marketing tools, internal tools, and email/document builders.

React-component-driven (you bring the components)

• ★ Puck — open-source, React-first, drop in your own components, get a visual editor. The most loved open-source page builder in 2026 for "marketing landing pages inside our app."
• Builder.io — visual editor + headless CMS. Generous free tier; the most polished commercial offering.
• Plasmic — design + visual builder, headless. Free for small teams; paid above.
• Craft.js — React framework for building page builders (not a builder itself). Pick this if Puck isn't customizable enough.
• Tina CMS — visual editor on top of git-backed markdown/MDX; great for marketing sites.

Framework-agnostic

• GrapesJS — venerable open-source builder; works with any frontend. Less React-friendly than Puck.
• Studio Editor (built on GrapesJS) — newer commercial polish.

Email / document builders

• react-email — components for transactional email (write JSX, get email HTML).
• maily.to — open-source email-newsletter editor on Tiptap.
• Knock, Loops, Resend — hosted email tools with built-in editors and free tiers.

Form builders

• FormKit Drag & Drop, Tally, Fillout, Plate Form Builder — varying levels of free.

Pick this if…

• You want a visual editor in your own app, free, React: Puck.
• You want it polished and don't mind paid-after-free-tier: Builder.io or Plasmic.
• You're rolling your own bespoke builder: Craft.js.
• Marketing sites with git-backed content: Tina.
• Email templates: react-email.