A new plugin developed by one of our users, Adrian Rosian
, for Joomla:http://extensions.joomla.org/extensions/access-a-security/site-security/spam-protection/19095
JJAntispam helps you prevent spam registration on your Joomla website by checking the spammer's signature against the spambusted.com spammer database. If the user that tries to register gets a positive hit, he is denied registration.
In version 1.3 if you block users you are automatically reporting them to SpamBusted. This way their IP will never bother you again.
In version 1.4 you can add an extra layer of security by checking against Botscout as well. Since version 1.4 uses Joomla transport layer for server-to-server communication, Joomla 2.5 is most recommended.
Author Website: https://www.joomlajingle.com