Here are some extensions which are interesting: - [`x-visibility` and `x-status`](https://github.com/Typeform/openapi-micro-merge#extensions) - [`x-unofficialSpec`](https://github.com/APIs-guru/openapi-directory/wiki/specification-extensions#x-unofficialspec) - [`x-logo`](https://github.com/Redocly/redoc/blob/main/docs/redoc-vendor-extensions.md#x-logo) and [another `x-logo`](https://github.com/APIs-guru/openapi-directory/wiki/specification-extensions#x-logo) - [`x-summary` and `x-description` for Path Item objects](https://help.apiary.io/api_101/swagger-extensions/#x-summary-and-x-description) - [`x-codeSamples`](https://github.com/Redocly/redoc/blob/main/docs/redoc-vendor-extensions.md#x-codesamples) and [Readme's version](https://docs.readme.com/main/docs/openapi-extensions#custom-code-samples) - [`x-contracts`](https://github.com/springframeworkguru/spring-cloud-contract-oa3#defining-contracts-in-openapi)
