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 …

willjenkins

Using the most effective features of other spam programs. Astounding Spam Prevention effectively guards against comment spam and registration spam without the use of a Captcha. 
This is a fork of the original Stop Spammers Spam Prevention and uses some of the code, but it is greatly simplified so it is not as aggressive and will not prevent a user from logging in. It does not interfere with jetpack and does not know about WooCommerce so there are no conflicts. Unlike Stop Spammers it does not check logins, but only checks registrations and comments. 
It also repairs many bugs that I found in the Stop Spammers plugin and has many new methods for detecting spam.
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Astounding Spam Prevention

Based on Stop Spammers, this lightweight spam stopper is still aggressive enough to stop 99% of the spammers and robots hitting your site. It is careful to never lock a webmaster out of WordPress. The options interface is slick and the logging is very very useful. 
I use it on 11 of my sites and I have my clients all using it.
Thanks to Will and all the effort he put in to make this plugin extremely useful while still being very very safe.

Works like a charm

It kills the spam

Got dozens of registrations after installing and activating all options. It made no difference what options were set. Uninstalled.

Made no difference to the spam

Very effective anti-spam plugin that eliminates comment spam, and registration spam. Combines many effective methods for identifying spammers and keep …

FraudGrade vs Astounding Spam Prevention