One important difference between RAML and Swagger is that Swagger is not owned by a single company. Swagger working group is working on an open governance model

One important difference between RAML and Swagger is that Swagger is not owned by a single company. Swagger working group is working on an open governance model to make it even more vendor neutral. Everything about Swagger is open. Disclaimer: I'm working on Swagger on behalf of Apigee.