Limit Login Attempts with IP blocking, brute force protection, Google recaptcha on login as well as registration from spam protection, rename login url, XMLRPC etc.

Security with firewall, malware scanner, login and spam protection, and encrypted backup. WP Security Plugin includes Login Security, Limit login attempts, Spam Protection, Content Protection, Blocking & more to Secure WordPress

Sucuri Security Website Firewall (CloudProxy) is a subscription based WAF and Cloud-based IPS designed to provide optimal security to everyday websites.