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Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification (see the feature table). It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. The primary target platform for Sofia-SIP is GNU/Linux. Sofia-SIP is based on a SIP stack developed at the Nokia Research Center. Sofia-SIP is licensed under the LGPL.

vqcc-gtk is a chat application written in C for the GTK+ toolkit, primarily used in small LAN's. It is based on quickChat/Vypress Chat (TM) for Windows (from Vypress Research) and is licensed under the GPL. The application supports both quickChat and Vypress Chat(TM) protocols and hopefully is compatible enough to substitute those applications when using Linux, FreeBSD or another *NIX desktop. You need no server to run, however it is not possible to communicate outside your LAN (or subnet). (From the About page)

This is a Java applet and application that can encode and decode a Cisco router's configuration register. It also shows some valuable notes for each router family that can help with disaster recovery. It is being released as part of the Cisco-centric Open Source Initiative.

fprobe: a NetFlow probe - libpcap-based tool that collects network traffic data and emit it as NetFlow flows towards the specified collector.

Hawk is a web based utility for monitoring and comparing hosts on your network with what is in DNS. Hosts that are answering pings but are not in DNS may be unauthorized, and addresses in DNS which are not answering may be able to be reclaimed. Hawk monitors all hosts on the networks you specify and lets you view them via a web page. Hawk consists of a backend written in Perl that monitors hosts by ICMP pings and writes the status to a mysql database. The frontend is in PHP and lets you select which network to view, and how to view it. This version has several enhancements to the original; including cleaner Perl code, a user-definable string to designate unused addresses that are in DNS, testing that the forward and reverse hostnames match, and the daemon forks one process pre subnet.

IP Stack Integrity Checker Its purpose is to test the stability of an IP Stack and its component stacks (TCP, UDP, ICMP et. al.) It does this be generating random packets of the desired protocol. The packets can have tendencies. ie by default all packets have a 50% chance of having IP Options. The packets are then sent against the target machine to either penetrate its firewall rules or find bugs in the IP stack.

Jnettop is a traffic visualiser, which captures traffic going through the host it is running from and displays streams sorted by bandwidth they use.

LG is a Looking Glass written in Perl as a CGI script. It can execute almost all BGP-related commands and do ping and traceroute in routers or relay these queries to other looking glasses. It supports both IPv4 and IPv6 commands, and is tested with Cisco, Zebra and Juniper. It can connect to router using either SSH, telnet or rsh protocol.

mtrace is a program to trace the routes taken by IPv4 multicast traffic flows.

klg is a looking glass written in PHP that can access and report back routing information from Cisco, Juniper and Zebra/Quagga routers. It can also lookup AS numbers to names via WHOIS interfaces, and supports friendly BGP community names via MySQL database.