DummyAuthenticator is now a part of JupyterHub core. You can migrate to it by setting:
c.JupyterHub.authenticator_class = "dummy"
The JupyterHub documentation has more information on how to setup a development environment
Dummy JupyterHub Authenticator
Simple authenticator for JupyterHub that allows all user logins regardless of password. Useful only for testing, do not use for anything actually serious!
pip install jupyterhub-dummyauthenticator
Should install it. It has no additional dependencies beyond JupyterHub.
You can then use this as your authenticator by adding the following line to
c.JupyterHub.authenticator_class = 'dummyauthenticator.DummyAuthenticator'
If you want, you can set a static global password for all users. This provides slightly more security, but not that much more than having no password set :)
c.DummyAuthenticator.password = "your strong password"