deenison

Lorem User Generator uses <a href="https://randomuser.me" rel="nofollow ugc">randomuser.me</a> API to generate as many random user data as you want to your WordPress for application testing. 
It’s like Lorem Ipsum, but for users.

Lorem User Generator

This plugin is helping us a lot to generate dummy users for tests.

Great and simple. Just works

Ideal plugin for testing environment. Hasn't been updated in a while, but works flawlessly still on WordPress 5.1 and PHP 7.2.

Works perfectly still

Like Lorem Ipsum, but for users. A straightforward way to add randomly generated users to your WordPress.

willemdumee

Generate fake users easily for testing purposes. You can choose between 2 themes: 
* Star Wars 
* The Simpsons
User Generator will generate id, username, screenname and email for the amount of users that you have set.

CTRL User Generator

Easily generate a bunch of new - fake - users to test your plugin / theme of website

Lorem User Generator vs CTRL User Generator