Sir-Uli

This plugin provides a possibility to block comments based on words of a predefined list. The built-in lists of wordpress only allow to send comments to the moderation- or to the spam-queue but not to block them completely. This is remedied with this plugin, which allows to block comments based on a definable list.
Attention #1: Use wordlist with care, there is no logging of the blocked comments!
Attention #2: It will also match inside words, so “press” will match “WordPress” as well!

WU – Block comments

This plugin provides a possibility to block comments based on words of a predefined list.

shanebp

Allow your moderators to block spammers from using the forum.
Moderators can mark Topics and Replies as spam, but they cannot change the forum role of a user. This plugin allows them to block users without giving moderators additional access to wp-admin.
If a user exceeds the spam limit as set by the ‘Spam Limit’ field in bbPress Settings, the forum role for that user will be changed to ‘Blocked’, meaning they can no longer use the forums. If moderators unspam the posts by a user and the number of spam entries by that user falls below the Spam Limit, then the forum role for that user will be changed to ‘Participant’.
Site admins can review and set the number of spam flags, if any, for each user at the bottom of the Edit User screen in wp-admin.
This plugin is very lightweight. It does not manipulate posts. It only fires when a Topic or Reply is marked as spam or unspam.
For more information about this plugin, please visit <a href="https://www.philopress.com/products/bbp-auto-block-spammers/" title="bbP Auto Block Spammers" rel="nofollow ugc">bbP Auto Block Spammers</a>

bbP Auto Block Spammers

This plugin makes it easy to give your bbPress moderators an additional tool to control spam in your forums.

Good for helping to control spammers

A bbPress plugin that allows moderators to block bbPress spammers

WU – Block comments vs bbP Auto Block Spammers