Suricata

Suricata is a fiercely competitive, highly modern, and wildly popular Open Source IDPS engine that operates as the primary, heavy-weight alternative to Snort. Maintained by the Open Information Security Foundation (OISF), Suricata was engineered from the ground up to solve Snort's biggest historical flaw: multithreading. It was built specifically for massive, high-speed, modern enterprise networks. The absolute core differentiator of Suricata is its "Native Multi-Threading and Extreme Throughput." While older versions of Snort struggled on massive 10-Gigabit connections because they relied on a single CPU core, Suricata flawlessly distributes packet inspection across dozens of CPU cores simultaneously, allowing it to inspect massive volumes of enterprise traffic without dropping packets. Furthermore, Suricata natively supports the massive ecosystem of Snort rules, meaning transitioning to it is seamless. Because of its elite performance, deep protocol extraction (HTTP, DNS, TLS), and seamless integration with modern SIEMs (like Splunk and ELK), Suricata is the engine powering many massive enterprise security stacks and modern cloud firewalls.