I found some information from web search results that might be helpful for you. Here are some open source tools that allow managing RESTful resources using static files or configuration files:

- **RESTool**: A UI tool for managing RESTful APIs by editing a JSON configuration file. No JavaScript, CSS or HTML required.
- **Swagger**: A framework for designing, building, documenting and consuming RESTful APIs. It also has a cloud-based platform called SwaggerHub for collaboration and deployment.
- **OpenAPI.Tools**: A list of tools for working with OpenAPI specification, which is a standard for RESTful API design. It includes tools for auto-generating, converting, validating, documenting, testing and more.

I hope this helps you find the right tool for your needs. 😊

Sources:
1. RESTool — Open Source UI Tool for Managing RESTful APIs. https://medium.com/@danielsternlicht/restool-an-open-source-ui-tool-for-managing-restful-apis-32c18062502
2. API Documentation & Design Tools for Teams | Swagger. https://swagger.io/
3. OpenAPI.Tools - an Open Source list of great tools for Open API. https://openapi.tools/
4. 13 Free & Open Source Tools For API Creation, Management & Testing. https://www.how2shout.com/tools/free-open-source-tools-api-creation-management-testing.html
5. 10 Best Open Source Resource Management Software In 2023. https://thedigitalprojectmanager.com/tools/best-open-source-resource-management-software/
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