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Xtables-addons is a package that obsoletes the old patch-o-matic repository for the Linux kernel and iptables. Instead of patching the kernel source, extensions are built as modules and thus allow extending kernels without recompilation.
FPGA based hardware card which implements above 4 giga bps network traffic throughput under affordable hardware cost. With linux driver and kernel patch, software based IPTables/netfilter firewall can be easily upgraded to a multi-giga high end firewall.
The IP Personality project is a patch to the Linux kernels that adds netfilter features: it enables the emulation of other OSes at the network level, thus fooling remote OS detection tools such as nmap that rely on network fingerprinting.