Link and Openapi samples
OpenApi Spec 3.0.2 from Swagger
https://github.com/microsoft/api-guidelines/blob/vNext/Guidelines.md
https://docs.microsoft.com/en-us/azure/architecture/best-practices/api-design
https://cloud.google.com/apis/design/resources?hl=de
https://github.com/LufthansaOpenAPI/
https://github.com/OAI/OpenAPI-Specification/tree/master/examples/v3.0
https://developers.themoviedb.org/3/account
https://watson-api-explorer.mybluemix.net/
https://developers.zomato.com/documentation
http://vocadb.net/swagger/ui/index
https://openapi-generator.tech/
https://swagger.io/tools/open-source/open-source-integrations/