fraudgrade

By default, WordPress is an extremely secure system. However, it is also open to an enormous amount of vulnerabilities which are disclosed publicly on numerous different websites as they are found. That’s where FraudGrade comes in, to save you from potential WordPress exploits and spam.
Since threats are usually sent from behind an anonymizer such as a proxy server or Datacenter IP, the FraudGrade Fraud Detection and Prevention plugin can easily mitigate these risks. In addition to securing a WordPress website against 0-Day Exploits the plugin can also easily mitigate most types of hacking attempts via brute force, CSRF, LFI, SQLi, XSS and etc.
The plugin can also be used to deter most types of spam such as comment spam, xml-rpc spam, admin area spam, login attempt spam and etc. By clicking just a few checkboxes you can have your site secured in less than 5 minutes.
If you are having a high rate of spam and other fraudulent activities from certain countries the plugin will prove useful in your scenario. Configure any and all countries to be blocked from reaching your WordPress installation and even redirect them to an entirely different URL if required.
Detect and block blacklisted IPs which have been associated with online fraudsters. Checking over 50 DNSBL’s for issues such as malware distribution, hacking, credit card fraud, ransomware, spamming, botnets, and many other types of cybercrime activities and abuse.
FraudGrade deploys Artificial Intelligence and Machine Learning with Big Data to accurately assess the risk of any user worldwide on desktop and mobile browsers.
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<a href="https://www.fraudgrade.com/" rel="nofollow ugc">Fraud Detection and Prevention Services by FraudGrade</a>

FraudGrade

Protect Wordpress from hackers, bots and general bad users. Block connections from Proxies, VPN, Tor, Datacenters and blacklisted IPs and even block v …

Kevin Pirnie

This is yet another plugin that attempts to block spam form posts. We attempt to do so using some online list resources and block based on what we find throughout. We then mark the post as spam, and prevent any email from being sent from the site.
As of right now, this only checks the comment forms. We are working to build the checks into the major form builders.
<h3>Features</h3>
Checks form content against a massive list of potential spam words, checks form poster email addresses against a massive list of known spam email domains, checks the form posters IP address against a massive list of known spam IP addresses, and then checks the online DNSBL’s for listings.

Kev's Spam Stop

Plugin to attempt to stop spam form submissions.

FraudGrade vs Kev's Spam Stop