Tableutil is a utility for converting, aggregating, and performing operations (currently unions, differences, complements, and intersections) on lists of IP addresses. Its primary use is to convert files into a format pfctl(8) can read. It can read plain-text files with ranges (18.104.22.168-22.214.171.124), CIDR-style networks (192.168.0.0/24), single addresses (242.242.242.242), or host names (one.two.com). It can also read p2b files, the preferred file-format of PeerGuardian.
DD-WRT is an alternative firmware for the Linksys WRT54G/GS/GL and the Asus WL-500 deluxe 802.11g wireless routers. It was originally based on the Alchemy Firmware from Sveasoft Inc., which is in turn based on the original GPL'd Linksys Firmware and a number of other open source projects. It offers many advanced features not found in the original Linksys firmware, or even the firmware available for purchase from Sveasoft. It is also free of the product activation or tracking found in the Sveasoft firmware.
OpenBSD Live-CD Firewall is an OpenBSD-based pf (packet filter) firewall, with NAT, squid, DNS, and a DHCP server (dnsmasq) for internal clients preconfigured. Settings and log files can be saved to a USB device. Saved settings will be restored at the next reboot. Additional security related software is available on the CD (arpwatch, honeyd, ntop, portsentry, etc.)
Host Identity Protocol on Linux is an implemetation of the Host Identity Protocol (HIP) and the related architecture. HIP is a proposal to change the TCP/IP stack to securely support mobility and multi-homing. Additionally, it provides for enhanced security and privacy and advanced network concepts, such as moving networks and mobile ad hoc networks. HIP is "cool", which means that as a mobile VPN solution, when your network interfaces go up or down, there is no need to re-establish a secure tunnel.