Joel

User Spam Remover is a plugin for WordPress that automatically removes spam user registrations and other old, never-used user accounts. It also blocks the notification e-mail that WordPress normally sends to the administrator whenever a new user registers (annoying when that registration is spam!) and logs it instead.
The plugin adds a configuration panel so that all of these options can be turned on or off, and it logs and fully backs up all user accounts that it deletes, so that you can restore them if you need to.
Features:
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Automatically deletes user registration spam and other orphaned, never-used accounts.
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Very simple, enable and go! Doesn’t interfere with the normal user registration process in any way. So, it doesn’t add captchas or activation or anything else — you’re free to use it alongside a plugin that does, if you like.
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Blocks notification e-mail that WordPress normally sends to the administrator every time a new user registers (instead, logs this event).
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Fully configurable, with grace period for new accounts and optional username whitelist.
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Fully logs all actions and backs up all user accounts that it deletes so that you can seamlessly restore them if you ever need to.
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Please see requirements and installation instructions below, or online <a href="https://wordpress.org/support/topic/official-installation-instructions-and-what-to-do-about-errors/" rel="ugc">in the WordPress support forum</a>.
For more information, please go to: <a href="https://lyncd.com/user-spam-remover/" rel="nofollow ugc">https://lyncd.com/user-spam-remover/</a>

User Spam Remover

Great way to clean a long running site of "junk" users.

Removed over 29k in minutes..

Effective

Does not work with many WordPress sites throwing a fatal error about mysqli.

Fatal PHP error about mysqli on activation

I had 31000 subscribers on a old (WP 4.4) website where I accidentially had the option "anyone can register" turned on.
This plugin did the job of deleting all those subscribers. I had to do it in batches as it "only" deletes 1000 subs at the time.

Thanks a lot to the developer as it has saved me a lot of hassle!!

It works!

Automatically removes spam user registrations and other old, unused user accounts. Blocks annoying e-mail to administrator after new registrations.

mpvanwinkle77

NEW FEATURES 
The Plus version of this plugin is now free! It includes reCAPTCHA, Facebook Connect, Custom Field UI, Moderation, Custom Confirmation messages. More info at http://mikevanwinkle.com/simplr-registration-form-plus/
This plugin creates a user interface for adding custom registration forms to any post or page on your WordPress website. Simply navigate to the edit page for post or page on which you would like the form to appear and click the registration forms button. A popup menu will appear guiding you through the options.
The plugin also creates an interface for adding/removing fields to be used in the registration form.

Simplr Registration Form Plus+

Easy to include new fields and custom registration forms.
Amazing Plugin.



Great Plugin

Nice plugin, this is working nice after customizing some files as my requirements.



Nice Plugin, Thanks!

The plugin uses a old form or reCAPTCHA that is no longer supported. Web links to developer are dead. There is not a lot of documentation on the shortcodes. The app has potential but needs to be improved.

Plugin not maintained

This plugin allows users to easily add a custom user registration form anywhere on their site using simple shortcode.

User Spam Remover vs Simplr Registration Form Plus+