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AFWall+ (Android Firewall +) is an improved version of DroidWall front-end application for the powerful iptables Linux firewall.It allows you to restrict which applications are permitted to access your data networks (2G/3G and/or Wi-Fi and while in roaming).

The Bastille Hardening program "locks down" an operating system, proactively configuring the system for increased security and decreasing its susceptibility to compromise. Bastille can also assess a system's current state of hardening, granularly reporting on each of the security settings with which it works.

Quite simply, this makes securing a Linux box a simple, educational process. And it's free!

Integrated anti-virus, anti-spyware, firewall, anti-spam, anti-phishing, and backup technologies

Client-side software firewall, IDS, and anti-virus.

Gives computer users the ability to control what applications and programmes write to their drives, in real-time, preventing damage or corruption to personal files.

Firewall for Windows

Hotspot Shield creates a virtual private network (VPN) between your laptop and the wireless router. It acts as a firewall to protect your privacy on unsecured networks.

Linux firewall software.

Free firewall software.

m0n0wall is a project aimed at creating a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes (including ease of use) at a fraction of the price (free software).
m0n0wall is based on a bare-bones version of FreeBSD, along with a web server, PHP and a few other utilities. The entire system configuration is stored in one single XML text file to keep things transparent.

An open source web application firewall. Network based, http traffic logging with real-time monitoring and attack detection.

Firewall protection for a PC.

PC firewall software.

pfSense is a open source firewall derived from the m0n0wall operating system platform with radically different goals such as using OpenBSD's ported Packet Filter, FreeBSD 6.1 ALTQ (HFSC) for excellent packet queueing and finally an integrated package management system for extending the environment with new features.

Firewall software.

redWall is a bootable CD-ROM Firewall.

The SoftPerfect Personal Firewall is a free network firewall designed to protect your PC against attacks from the Internet or via a local area network.

Anti-virus software for desktop computers.

Your Freedom is anti-censorship software that bypasses firewalls and web proxies making the unaccessible accessible while hiding your network address.