Blockstack
From Organic Design wiki
Blockstack is
Authentication
Blockstack can work as an authentication provider for other Blockstack apps or for traditional websites. You can use the local app or the web version to perform the log-in service.
Using Blockstack
Install
To install yo and the Blockstack generator globally run:
sudo npm i -g yo generator-blockstack
To generate the app structure and install dependencies run (in the project directory):
yo blockstack
npm i
Then you can start the app like so:
npm run start
It will open a window in your browser at http://localhost:5000/