Open Source Security: 50 Good Apps: Page 3
Vyatta offers a free, enterprise-class firewall/router/VPN that runs on standard x86 PCs. Software upgrades, support, and pre-configured devices are also available for a fee. Operating System: Linux.
Ideal for small businesses, IPCop allows you to take any PC and turn it into a Linux-based firewall appliance for securing your network and improving Web browsing. It also includes a handy remote management feature. Operating System: Linux.
Like IPCop, SmoothWall turns old PCs into Linux-based network firewall appliances. Enterprise users and others with larger networks are encouraged to use SmoothWall Limited, the commercial version of the project. Operating System: Linux.
27. Firewall Builder
Firewall Builder is not a firewall, but it does make firewalls easier to use. It simplifies the process of establishing rules and supports iptables (netfilter), ipfilter, pf, ipfw, Cisco PIX (FWSM, ASA) and Cisco routers extended access lists. Operating System: Mac, Linux, Unix, BSD.
This firewall's claim to fame is that anyone can get it up and running in just a couple of minutes. It can be used on desktops, servers, or gateways, and the interface is very easy to understand. Operating System: Mac, Linux, Unix, BSD.
Nagios aims to inform you of problems with your network before your users do. And when it detects an attack, outage, or other problems, it can be configured to send you an alert via e-mail, IM, or text message. Operating System: Linux, Unix.
Formerly known as Ethereal, Wireshark bills itself as "the world's foremost network protocol analyzer" and "the de facto standard." It offers deep inspection of hundreds of protocols, live capture for offiline analysis, VOIP analysis, and much more. Operating System: Windows, Mac, Linux, Unix, BSD, Solaris.
This older packet sniffer uses fewer resources and has fewer security holes than the newer, prettier apps. Note that if you use Windows, you'll need a separate download known as WinDump. Operating System: Mac, Linux, Unix, BSD.
Nmap quickly takes inventory of your entire network, no matter what the size. As a result, security audits are easier and updates are simplified. Operating System: Windows, Mac, Linux, Unix, BSD, Solaris.
33. Angry IP Scanner
This fast, simple tool scans IP addresses and ports to provide information about your network. And if you need additional information other than what's provided with the standard tool, it's easy to write extensions. Operating System: Windows, Mac, Linux.
Honeytrap is designed to give you an early warning of an attack. It collects and displays data about possible attacks, but does not block intrusions. Operating System: Linux, BSD.
35. OCS Inventory NG
It isn't exactly glamorous, but having an up-to-date list of all the hardware and software on your network can be invaluable for security planning. OCS Inventory NG keeps track of all the devices on your network and provides details like OSes, software, processors, memory, and much more. Operating System: OS Independent.