Fake has been designed to switch in backup servers on a LAN. It has been used to success over the last year to switch in backup Mail, Web and Proxy servers during periods of both unscheduled and scheduled down time. Fake allows you to take over the IP address of another machine in the LAN by bringing up an additional interface and making use of ARP spoofing. The additional interface can be either a physical interface or an IP alias.
CIPE (Crypto IP Encapsulation) is an ongoing project to build encrypting IP routers. The protocol used is as lightweight as possible. It is designed for passing encrypted packets between prearranged routers in the form of UDP packets. This is not as flexible as IPSEC but it is enough for the original intended purpose: securely connecting subnets over an insecure transit network.
Eznet makes setting up PPP for Linux easy. Just enter the name of your ISP, a phone number to dial, the login name, the password and the TTY and eznet takes care of the rest. There are no chat scripts to write, nor any pppd configuration files to fuss over. Eznet handles multiple ISPs and can dialup any of them with a single simple command. It also supports dial-on-demand using either kerneld or diald.
oidentd is an RFC 1413 compliant ident daemon which runs on Linux, FreeBSD, NetBSD, Darwin, OpenBSD, and Solaris. It can handle IP masqueraded/NAT connections on Linux, FreeBSD, NetBSD, and OpenBSD, and it has a flexible mechanism for specifying ident responses. Users can be granted permission to specify their own ident responses. Responses can be specified according to host and port pairs.
dhcpcd is an RFC2131 compliant DHCP client. It is fully featured and yet lightweight: the binary is 60k as reported by size(1) on Linux i386. It has support for duplicate address detection, IPv4LL, carrier detection, and a merged resolv.conf and ntp.conf for which other DHCP clients require third party tools.
The DECnet for Linux project aims to provide the kernel-level socket layer and a set of applications to allow Linux systems to participate in a DECnet phase IV network. It currently has an application library (suitable for building DECnet functionality into X11R6), file and terminal access.
Trinux is a minimal Linux distribution that boots from a single floppy or CD-ROM, loads its packages from an FTP/HTTP server, IDE filesystem, or additional floppies, and runs entirely in RAM. It contains the most comprehensive set of network security tools available in any Linux distribution and can be used to conduct security research, analyze network traffic, and perform vulnerability testing of networks and applications.
ntopmg is a network probe that shows network usage in a way similar to what top does for processes. It acts as a Web server, creating an HTML dump of the network status. It sports a flow collector, an HTTP-based client interface for creating ntop-centric monitoring applications, and RRD for persistently storing traffic statistics. Its C++ core can be scripted in Lua, for changing the appearance and extending functionality.
The Advanced Linux Sound Architecture is composed of several parts. The first is a fully modularized sound driver which supports module autoloading, devfs, isapnp autoconfiguration, and gives complete access to analog audio, digital audio, control, mixer, synthesizer, DSP, MIDI, and timer components of audio hardware. It also includes a fully-featured kernel-level sequencer, a full compatibility layer for OSS/Free applications, an object-oriented C library which covers and enhances the ALSA kernel driver functionality for applications (client/server, plugins, PCM sharing/multiplexing, PCM metering, etc.), an interactive configuration program for the driver, and some simple utilities for basic management.