Hey all, my name is Christoph and we have just relaunched TypeHub https://typehub.cloud/ as general platform to quickly build SDKs in multiple programming languages for your REST API, in this sense it is a SDK as a service platform. Besides generating the SDK we provide a GitHub like flow to evolve your API specification, this means that every change is tracked as commit and you can create a tag to create a final release, it is also possible to submit a pull request to change an existing spec. We are still in an early stage but I like to share our current state.