Trustix Enterprise Firewall - world\'s first WYSIWYG Firewall.
Licenta: Freeware
Sistem operare: Win 3.1x,Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003,Linux,MAC 68k,Mac PPC,Mac OS X,Mac Other

A free firewall designed to protect your PC against attacks from the Internet.
Licenta: Freeware
Sistem operare: Win95,Win98,WinME,WinXP,WinNT 4.x,Windows2000,Windows2003

CONTENT FILTERING PROXY SERVER, WEB FILTER, INTERNET FILTER, REAL-TIME FILTER.
Licenta: Freeware
Sistem operare: Linux

NAT, IP-filtering, firewall, routing, port mapping, QoS, bandwidth, shaping.
Licenta: Freeware
Sistem operare: WinNT 4.x,WinXP,Windows2000,Windows2003

Free Trustix Enterprise Firewall - Total Security for Enterprise Networks.
Licenta: Freeware
Sistem operare: WinXP,Windows2003,Linux,Linux Open Source

Free Comodo Memory Firewall is a buffer overflow detection and prevention tool.
Licenta: Freeware
Sistem operare: WinXP,Windows2003,Windows Vista Starter,Windows Vista Home Basic,Windows Vista Home Premium,Windows Vista Business,Windows Vista Ultimate,Windows Vista Home Basic x64,Windows Vista Home Premium x64,Windows Vista Business x64,Windows Vista Ultimate x64

Free Proxy Toolbar that allows the user to surf the web anonymously.
Licenta: Freeware
Sistem operare: Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003

FREE Comodo Firewall Pro - Complete security against Internet attacks.
Licenta: Freeware
Sistem operare: Windows Vista Starter,Windows Vista Home Basic,Windows Vista Home Premium,Windows Vista Business,Windows Vista Ultimate,Windows Vista Home Basic x64,Windows Vista Home Premium x64,Windows Vista Business x64,Windows Vista Ultimate x64

Zelune, a free web proxy script availible to download at Zelunenet.
Licenta: Freeware
Sistem operare: Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003,Unix,Linux

Let you unblock and surf any website from proxy site.
Licenta: Freeware
Sistem operare: Win98,WinME,WinNT 4.x,Windows2000,WinXP,Windows2003,Windows Vista Starter,Windows Vista Home Basic,Windows Vista Home Premium,Windows Vista Business,Windows Vista Enterprise,Windows Vista Ultimate,Unix,Linux