Yes, there are a few of them.
ReDoc [Article on swagger.io] [GitHub] [demo] - Reinvented OpenAPI/Swagger-generated API Reference Documentation (I'm the author)
OpenAPI GUI [GitHub] [demo] - GUI / visual editor for creating and editing OpenApi / Swagger definitions (has OpenAPI 3 support)
Responsive Fork of SwaggerUI [GitHub] [demo]
SwaggerUI-Angular [GitHub] [demo] - An angularJS implementation of Swagger UI
angular-swagger-ui-material [GitHub] [demo] - Material Design template for angular-swager-ui
Hosted solutions that support swagger:
- Apiary - can import from swagger
- Readme.io - can import from swagger
- Lucybot console - supports swagger natively
- Postman - can import from swagger
- Stoplight - supports swagger natively - editing and reading
Check the following articles for more details:
- Ultimate Guide to 30+ API Documentation Solutions
- Turning Contracts into Beautiful Documentation (focused mainly on Swagger)
- An evaluation of auto-generated REST API Documentation UIs (focused mainly on Swagger)
- Free and Open Source API Documentation Tools
