Hawk IDS/IPS is a lightweight log analyzer which was designed to be fast and efficient. It scans log files on the fly and bans IPs which make too many password failures. It adds iptables rules to reject the IP addresses. You can define the logfiles. Hawk provides a unique Web interface and flexibility, and supports sshd, dovecot, courier, pure-ftpd, proftpd, cPanel, and DirectAdmin.
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.