Open Source Server Operating Systems Firewall Software

Privoxy is a non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data and HTTP headers, controlling access, and removing ads and other obnoxious Internet junk. Privoxy has a flexible configuration and can be customized to suit individual needs and tastes. It has application for both stand-alone systems and multi-user networks.

OpenSnitch is a GNU/Linux port of the Little Snitch firewall. You can launch the GUI from the icon or from the system menu. The daemon will start intercepting connections, prompting you to allow or deny them. If you don't apply an action, after 15 seconds (configurable) it'll apply the default action configured. When you open the GUI, you'll see all the connections and processes that the daemon has intercepted. Double click on a row to view the details of a process, rule, host or user. Once you know which are the common processes, IPs and hosts that your machine is connecting to, you can start creating permanent rules (Duration: always) to deny or allow them. You can also convert temporary rules to permanent by right-clicking on a temporary rule or by double-clicking on it, and then edit it. By default OpenSnitch UI listens on a local Unix socket in /tmp/osui.sock.

wipfw - IPv4 packet filter and traffic shaper for Windows based on IPFW (FreeBSD firewall).

WinFail2ban scans log files/event viewer and bans IP that makes too many password failures.

This program is intended to be used by Network Administrators. It is used to test connectivity on specific ports. THis program returns a simple pass or fail. Java 6 is required.

chainssh is a shell script to smplify the ssh login via multiple sshgateways/firewallgateaways. e.g. connect from homehost via sshgateway to a clusternode with one command.

CartoReso intends to facilitate enterprise computer network mapping.

Hank is a scalable, extensible, modular, threaded user-space program to handle all your packet juggling needs. It'll analyze, report, and act on network traffic in any protocol, at any OSI layer, at any nesting depth. And it'll do it damned fast.

Rivoreo's fork of IP Filter firewall software. Original project page https://sourceforge.net/projects/ipfilter/

IPFC is a distributed management solution for security module (firewall, nids). Security module can be packet-filtering (ipfw,netfilter,ipf ...), NIDS or any other servers (syslog...) or embedded devices.

Internet Control Firewall Intrusion Detection and Logger for Inbound and Outbound Traffic. Watches Files and Directories, Drive and Memory Protection.

OpenVPN is a robust and highly flexible tunneling application that uses all of the encryption, authentication, and certification features of the OpenSSL library to securely tunnel IP networks over a single TCP/UDP port. Discussion forums and project wiki can be found here: https://forums.openvpn.net/ http://community.openvpn.net/openvpn

Pothos is an iptables log analyzer. It is used to interpret, in a user-friendly fashion, the logs that ulogd creates with it's MySQL plugin. It's main objective is to be efficient, leaving as small a foot-print as possible.

This project aims to provide an easy to use interface to Samba, openLDAP, and Printing (via cups, iptables, emerge and apt-get. It currently is command-line based, and has the beginnings of a graphical interface via kommander (see quanta).

The SWAP (Secure Wireless Access Point) project is intended for use in embedded appliances. These appliances will operate in the role of a WEP (wireless encryption protocol) and IPSEC enabled wireless access point, IPSEC VPN gateway, and firewall.

This is a program in script shell to manage user accounts, groups, rules and parameters for Squid Proxy. This application was developed to help new system administrators providing an easier and faster way to do this job.

TSIC is a comprehensive solution for secure Internet connection against all kinds of threats and harmful programs for Windows platforms and ReactOS. It's features include a built-in FIREWALL,IDS,Parental and privacy Control and also antivirus.

Bastille Linux is a Hardening and Reporting/Auditing Program which enhances the security of a Linux box, by configuring daemons, system settings and firewalling. It currently functions on most major Linux distributions and HP-UX. In the past, it has hardened Mac OSX as well. We are working on a code update to modern Linux distributions.