A network scanner that detects Microsoft Windows shares using the SMB protocol.

A generic IP network transaction auditing tool that performs network monitoring.

A set of network diagnostic tools, such as an enhanced replacement for traceroute.

Free effective anti-virus security solution for systems running Linux; free updates of all signature files and high scanning speed.

Offers file integrity verification via digital fingerprints.

Vexira Antivirus for Linux workstations and servers. A complete virus defense system designed for easy and dependable virus prevention on Linux systems.

Cheops is a complex network utility integration tool that offers network topographic visualization.

A Crypto IP Encapsulation project. Offers a protocol that passes encrypted packets between prearranged routers in the form of UDP packets.

An authentication and accounting server for terminal servers that speak the RADIUS protocol.

Protocol LAN analyzer that can monitor various interfaces: ISDN, PPP, Token Ring, standard: loopback, 10baseT Ethernet.

The famed Computer Oracle and Password System is a suite of tools that can automatically detect configuration problems or holes in your system.

Freeware PGP, Pretty Good Privacy interoperable encryption software package. CTC is Rot13 for PGP.

A circuit-level firewall and proxy that can be used to provide convenient and secure network connectivity to a wide range of hosts. Very similar to a SOCKS implementation.

Performs emulation of other operating systems and vulnerabilities not found on the host; in order to deceive and solicit invaild attempts of exploitation by malicious individuals.

An application-level gateway server.

Adds the ability for a network administrator to set packet filtering rules via a web page interface. unsecure from an external source, but very easy to use for intranet management.

A tool for automatically debugging databases by performing a zone transfer of a current zone. Inspects individual records for inconsistencies, and generates warnings or errors where appropriate.

A BSD-based firewall with source included. This binaries main value is that it is perfect for beginners learning how firewalls are developed.

A protocol analyzer that supports ethernet, Token Ring, SLIP, PPP, ISDN, and loopback.

Free software package for booting x86 PCs over networks.

Network protocol analyzer for Unix that allows examination of data from a live network, or from a capture file on disk.

Allows the user to take over the IP address of another machine in the user's LAN via ARP spoofing.

Suite aimed at turning a minimally configured consumer PC into a standalone internet firewall; complete with address translation, proxying, and IP packet forwarding.

Free Tabular DataStream package. Tabular DataStream is a client-to-database server protocol in SyBase and Microsoft SQL database implementations.

An open source OpenPGP compatible encryption system. Provides data integrity services for messages and data files by using digital signatures, encryption, and compression.

Datagram sniffer for the Linux operating system.

The ultimate resource for securing your linux workstation/server.

A network scanner that uses spoofed source address packets. Mainly used to test firewall rules and to perform advanced TCP/IP related attacks like the idle scan.

Hummer is a complex tool that lets you distribute security and intrusion detection information between several hosts. Therefore, it can be used to detect sophisticated attacks where multiple attackers and targets are mixed and matched.

icmpquery is a tool for sending and receiving ICMP queries for the destinations address mask and current time.

An advanced TCP/IP packet filter suitable for use in firewall environments. Can be loaded as a module or compiled into the kernel.

Helps inexperienced Linux network administrators perform IP masquerading and firewalling on a small network easier.

A packet sniffing tool, based on the Berkeley packet capture library; that prints complete data-link, network, and transport layer header information for all packets it sees.

Performs logging of incoming IP packets by utilizing a multi-threaded approach. Administrators can perform filtering of captured packets.

IPTraf is a console-based network statistics utility that gathers TCP connection paket and byte counts, interface statistics, and activity indicators. Also captures all TCP/UDP packets.

Consists of tools to create a firewall for dialup machines.

Freeware for Unix/Linux/FreeBSD/OS2/BeOS/Windows 95/98/ME/NT4. Web proxy that filters banner ads, cookies, and referer tracking. Supports wafers and User-Agent spoofing.

Linux Pluggable Authentication Modules (PAM) is a flexible mechanism for authenticating users using alternative authentication schemes.

Tool that interactively builds a firewall using ipfwadm, ipchains, or netfilter/iptables firewalling. [GPL]

A log analysis program that interfaces with the SNORT open source Intrusion Detection System to provide real time visual notification when an intrusion signature has been detected on the network.

Strong user authentication and access control for Linux environments in a fully integrated system using PAM modules.