snort_inline is basically a modified version of Snort that accepts packets from iptables and IPFW via libipq(linux) or divert sockets(FreeBSD), instead of libpcap.
"This site takes Open Research and produces a number of feeds, the most prominent being signatures for Snort, Dragon, and other IDS/IPS platforms. We welcome your contributions, ideas, or just tweaks. What makes this project so effective are both the idea