Suricata is an Intrusion Detection and Prevention (IDS/IPS) engine developed by the Open Information Security Foundation and its supporting vendors. The engine is multi-threaded and has native IPv6 support, file extraction capabilities, and many more features. It's capable of loading existing Snort rules and signatures, and supports many frontends through Barnyard2.
Release Notes: Packet capture issues at startup were fixed. Various JSON output issues were fixed. A crash case at rule reload was fixed. Default optimization level was restored. Fast-log output drop information was restored.