MyBB Community Forums

Antibot and antispam protection. Free script (GNU GPL v3) and Cloud Service (paid).
Cloud check protects against automatic registrations and automatic spam up to 99%
A free (local) script protects well too =)

Download: https://antibot.cloud/#MyBB

Install on MyBB any version:
Upload the /antibot/ folder to the root directory of the domain (even if the forum itself is located in a subdirectory).
To fully protect the entire forum (anti-spam + anti-bot) - connect the AntiBot in inc/config.php
To protect against spam registrations only - in member.php

Connect string:

require_once($_SERVER['DOCUMENT_ROOT'].'/antibot/code/include.php');

Still have questions? - ask in this thread.

plugin should be uploaded here at Extend Section => new project

Edit: related guidance => MyBB : managing projects