Open Source Firewall Software

Siproxd is a proxy/masquerading daemon for the SIP protocol. It allows SIP clients (softphones & hardphones) to work behind an IP masquerading firewall or router.

tgcd is a simple Unix network utility to extend the accessibility of TCP/IP based network services beyond firewalls. This can also be used by network analysts and security experts for penetration testing and analyze the security of their network. It's written in C Language.

ReAIM is an AOL Instant Messenger Proxy for iptables-based firewalls. It allows direct connections to be made to hosts behind an address-translating firewall. MSN and Windows Messenger are also supported.

Defa Protector is A Simple PHP and Wordpress Plugin To Protect and Prevent Video Save As From Browser and Some Video Grabber. There is 100% Guaranteed Protection and There might be some tradeoff but If you care about Digital Rights Management of Your Video and Music Content. This Project is for you. Defa Protector 6.7.1 Revamp Code For Better Performance To The Bone. We almost rewritten this project from scratch.

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

Snort2Pf is a small Perl daemon which greps Snort's alertfile and blocks the "naughty" hosts for a given amount of time using pfctl.

Open source firewall project for Unix systems

Packet Filter (PF) is OpenBSD\'s firewall and traffic shaper. This is a port of this excellent software to FreeBSD.

A set of tools (proxy, analyzer, proxy database maintenance tools) in Perl. Of interest to those whose Internet access is blocked or censored. The tools provide an 'abstraction' of uncensored outside services, inside the censoring firewall/proxy.

UCAS or Universal Central Admin System.Client to Server API system for administrating Unix/Linux/BSD systems that allows a quick and effective method for keeping control of all your servers in one central system.