Beta is down but you need to test your client? Use this! PostMocker will take a Postman Collection file where the responses are saved, and serve those up at the appropriate routes!
You can install PostMocker using pip:
$ pip install git+https://github.com/czardoz/postmocker
Locate your collection file, and let PostMocker do its job:
$ postmocker -c /path/to/collection/file.json
This is beta software. Some things might break, and some things are not implemented at all.
Released under the MIT license.