Free computer network security software for windows

Astaro Security Linux is an all-in-one network security gateway that
includes a firewall, intrusion protection, virus protection, spam
protection, URL filtering, and a VPN gateway. Features include stateful
packet inspection, deep packet filtering, application-level intrusion
detection, content filtering, virus detection for email traffic (SMTP
and POP3) and Web traffic (HTTP), whitelists and blacklists, IPSec and
PPTP VPN tunneling, spam blocking, logging and reporting. The software
is built on an embedded, especially hardened Linux distribution. The
WebAdmin tool and Up2Date service make it easy to install, manage, and
update all six security applications.

Active Network Monitor lets system administrators gather information from every computer on the network without installing server-side applications. You can even take snapshots of the systems and network status for future comparisons and change tracking.
Features:
- Use the growing list of plug-ins for gathering important information from the remote computers.
- Scan network computers by types (Server, Workstation, SQL Server, etc.).
- Scan network computers by names (you can select computers either from the network tree or load a predefined list from the file).
- View information immediately from a plug-in, rather than wait for a scan process of all your computers to be completed.
- Save retrieved information into the project in the special folder or into the external file.
- Load previously saved information from the project or from the external file.
- Export retrieved information into the CSV or TXT file.
- Compare two previously saved projects or external files using special simple to use Compare Wizard.
- Save compare results to the external file.
- Easily navigate through the compare results using special buttons.
- And much more!
Enhancements:
- Added new plug-in - Performance Information. It retrieves information about the operating system resources (memory, CPU usage, etc.).
- The Security Patch Analyzer plug-in now reports about the default permissions provide the Everyone group with Full access on the system root folder. The Windows 2000 default permissions could enable an attacker to mount a Trojan horse attack against other users of the same system.
- Minor internal improvements.

CyD Network Utilities 2010 are such convenient and helpful network tools that are designed to allow users to diagnose networks and monitor your computer's network connections.

This is an excellent collection of easy-to-use network utilities for any network administrator. CyD NET Utils offers many TCP/IP utilities in one program. Its capabilities include: check oopen ports (checking running services), scanning for open resources and security test.

This software is created by hackers and security specialists for system administrators and security specialists. The main module is a Security tester that allows you to test WEB server or WEB site on SQL Injection errors, include errors, and XSS injection.

Major Features:

1. The software will be always functional (instead of trial period)
2. No time and function limitations
3. Closed functions will be accessible
4. All updates and new versions are FREE in two years!
5. Registration code and instructions will be delivered to you by e-mail
6. Free e-mail technical support

Network Switcher is a small and simple tool with an intuitive interface which allows you to configure your computer network cards and switch between configurations through the use of profiles.
This is the perfect solution for notebook users. Although the configuration is limited to the TCP/IP protocol, Network Switcher is extensible through the use of plugins; included with the base package is a plugin to enable or disable Internet Explorer proxy server.