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» npm install swagger-codegen
I did a search in Github and found some projects (SDKs) generated by Swagger-Codegen.
Here is one example: Online Convert API2 Swift SDK
You can also refer to the Swagger-Codegen Github page for discussion on use case of Swagger-Codegen
UPDATE: Here are some but not all companies/projects using Swagger Codegen in production: https://github.com/swagger-api/swagger-codegen#companiesprojects-using-swagger-codegen
Note: As of July 2017, Swagger Codegen offers more than 70 generators for API client, server stubs and API documentations.
UPDATE: On May 2018, about 50 top contributors and template creators of Swagger Codegen decided to fork Swagger Codegen to maintain a community-driven version called OpenAPI Generator. Please refer to the Q&A for more information.
As a platform architect and DevOps, I can say I successfully introduced it into a project which uses Dreamfactory API Automation as BaaS and APIs are defined by swagger. So the SDKs for the mobile app aswell as internal applications are generated with swagger-codegen. We encountered a few bugs in the swagger-codegen template for our languages, which were fairly easy to fix. Overall it saved alot time and reduces potential sources of error.