Sumada Kaabaha: bad bots
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Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection
Stop Bad Bots Protection, Block SPAM bots, Crawlers and spiders and botnets. Save bandwidth, avoid server overload and content steal. Blocks by IP.
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ShieldUp – Bad Bots, Scrapers, Attackers
ShieldUp helps you to tackle bad bots, scrapers, hackers, enhancing website security and optimizing performance for a seamless user experience.
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crawler-hunter
It is a simple but effective plugin. Stops spam bots by checking browser content. You can also add an ip address to the blacklist.