What are the best open source form builders?

Here are some of the best open-source form builders, depending on what you want to do:

1. Form.io

• Type: Full-stack form platform
• Best for: Complex, data-driven apps and enterprise workflows
• Pros:
  • Powerful drag-and-drop form builder
  • API-driven forms and submissions
  • Good for conditional logic, workflows, and integrations
• Cons:
  • Can feel heavy for simple use cases
  • Some advanced features are enterprise-focused
• Tech stack: JavaScript / Node.js

2. SurveyJS

• Type: Form/survey builder library
• Best for: Surveys, questionnaires, and dynamic forms in web apps
• Pros:
  • Highly customizable
  • Supports conditional logic, validation, localization
  • Can be embedded into React, Angular, Vue, etc.
• Cons:
  • More of a library than a ready-made hosted builder
• Tech stack: JavaScript

3. Formbricks

• Type: Product feedback / survey platform
• Best for: Embedded feedback forms, NPS surveys, and user research
• Pros:
  • Clean UI
  • Modern developer experience
  • Open source with self-hosting
• Cons:
  • More opinionated toward product feedback than general forms
• Tech stack: TypeScript / Next.js

4. OhMyForm

• Type: Open-source form backend and builder
• Best for: Simple forms and submissions
• Pros:
  • Easy to self-host
  • Good for basic form collection
• Cons:
  • Less actively developed than some others
• Tech stack: Node.js

5. NocoDB

• Type: No-code database/spreadsheet platform with form features
• Best for: Internal tools and lightweight form workflows
• Pros:
  • Can turn tables into forms quickly
  • Great if you want database-backed forms
• Cons:
  • Not a dedicated form builder
• Tech stack: Node.js

6. BudiBase

• Type: Open-source internal tool / app builder
• Best for: Admin forms and internal dashboards
• Pros:
  • Form generation from data models
  • Strong internal-app focus
• Cons:
  • Overkill if you only need public forms
• Tech stack: Node.js

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Best picks by use case

• Best overall for power and flexibility: Form.io
• Best for surveys: SurveyJS
• Best for product feedback: Formbricks
• Best for internal tools: BudiBase or NocoDB
• Best lightweight option: OhMyForm

If you want, I can also give you:

1. a comparison table,
2. the best ones by stack (React/Vue/Node/etc.), or
3. the best self-hosted alternatives to Typeform.