AppTrana provides advanced, unmetered DDoS protection and secures your web apps and APIs from malicious traffic while ensuring application availability with a guaranteed uptime of 99.99%. Not just thwarting illegitimate traffic tries to enter the network, it monitors each traffic and protects from all types of DDoS attacks, including layer 3, 4, & 7 attacks, known and emerging threats. It also includes 24/7 expert support and coordination in mitigation.
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Akamai Web Application Protector - Web Application Protector is designed to safeguard web assets from web application and DDoS attacks, while improving performance.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
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Wordfence - Comprehensive security plugin for WordPress.