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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.

Flexible web-based firewall log analyzer, supporting netfilter and ipfilter, ipfw, ipchains, cisco routers and Windows XP system logs, and mysql or postgresql database logs using the iptables ULOG or NFLOG target of netfilter others mapped to the ulogd format with a view. Fully supports IPv6 for database logs, and netfilter and ipfilter system file logs. Also supports Maxmind's GeoIP version 2 location databases. For Linux, FreeBSD, OpenBSD, Solaris, OSX,etc.

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

Campagnol is a decentralized VPN over UDP tunneling. It uses UDP hole punching to open connections through NAT/firewall and OpenSSL's DTLSv1 implementation for mutual authentication and encryption.

py-PF is a pure-Python module for managing OpenBSD's Packet Filter. It aims to combine the flexibility of PF's C API and the power of Python, making it easier to manage PF data and to integrate firewalling capabilities in more complex applications.

Open source firewall project for Unix systems

Anoubis is a Security Suite which implements a secured environment for applications. The core of the suite is an Application Firewall alongside with a Sandbox. Mechanisms to assure the authenticity of files, directories and applications are provided.

OpenUTM is an open source Unified Threat Management software framework to be used to combine together other open source projects to build an easily managed UTM firewall appliance.

A fast PPTP proxy for any BSD with OpenBSD packet filter installed. It handles multiple transparent bi-directional tunnels, and can be chained from one proxy to another over several servers.

pptp-proxy is a proxy for the Point-to-Point Tunneling Procotol. It handles multiple tunnels on a nat-box driven by pf. pptp-proxy relies on Niels Provos's libevent.

Sonate is a java GUI for OpenBSD pf packet filtering. Optional code can be compiled to OpenBSD host to transfer generated configuration using SSL

a logging system for openbsd's pf. uses postgresql for storage, and is designed to cope with an unreliable network connection to the database.

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

Remote Packet Filter Control Daemon allows remote control and monitoring of OpenBSD's packet filter. It communicates with clients using RPFC protocol running on top of SSL (Secure Socket Layer).

Hogwash is an inline packet scrubber that uses Snort's (www.snort.org) detection engine to drop malicious packets before they reach the target machine.

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.