The User Registration Form add-on allows register new users through a form created with the Calculated Fields Form plugin.
The add ons allows even create the users' metadata required by other plugins.Documentation
Easy to activate
To activate the add-on, simply visit the plugin page via the menu option: "Settings/Calculated Fields Form", tick the checkbox: "CFF-User Registration Form", and press the "Activate/Deactivate Addons" button.
Select the fields in the form for the users data, the role to assign the users, decide sending or not a notification to the new users, the website administrator or both, define the error messages, etc.