Emsisoft - 10.2MB - Пробная версия (Trial)
Online Armor enables users to protect your computer from unwanted external access. It prevents hackers from accessing your computer, stops malicious programs invading into your computer and sending your data over the internet, protects you during your online banking and transactions, and safeguards your identity. Online Armor is easy to install and manage, and does not slow down your computer performance. The freeware version has slightly limited functionality and no automatic updates.
Besides, Online Armor protects your passwords and private information from being stolen by blocking keyloggers as they try to activate. Online Armors behaviour detection ensures that even specially created or new keyloggers are detected and prevented. 

Ashampoo - 8.38MB - Бесплатно (Freeware)
The Ashampoo FireWall makes it easy for anyone to set up an effective, free firewall. Its Configuration Assistant guides you through every step of the the setup process. Easy Mode makes using it a breeze. You don't need any special technical knowledge, and everything is explained clearly. Even with its additional security tools, Ashampoo Firewall is a tiny program that uses very little memory and computer resources. You get heavy-duty protection without a heavyweight load on your system. The Ashampoo FireWall user interface explains itself every step of the way. The information is right there on the screen where you need it so that most users will never need to consult the help files.
The program's interface is sleek and intuitive, with its functions neatly organized in tabs. Users don't have to do much to configure the program initially; it will automatically notify users when an application attempts to connect to the Internet and ask whether users want to allow this action. Users can also go into the program and manually add rules for various programs.

ZoneAlarm - 5.7MB - Бесплатно (Freeware)
ZoneAlarm Firewall Free  has gotten quieter and more effective, and should be considered an excellent tool for replacing the adequate default Windows firewall with a stronger option that includes better outbound protection, antiphishing guards, and ZoneAlarm's behavioral detection network.
Key Features  :

  • Proactively protects against inbound and outbound attacks while making you invisible to hackers.
  • Backs up and protects your files in the event of accidental deletion, disc failure, loss or theft.
  • New interface that delivers a simple overview, One-click "Fix It" buttons and customization controls for more advanced users.Additional Layers.
  • Multiple layers of advanced protection for unsurpassed security. 

Comodo - 5.24MB - Бесплатно (Freeware)
Comodo Firewall is a simple, effective and discrete personal firewall. It’s easy enough to use - no matter what your computer skills are - and displays very informative notifications. Comodo's award-winning firewall provides users with prevention-based PC protection that slams the door shut on viruses, malware, and hackers. Firewall is also a part of Comodo Internet Security Pro 2011, which gives you the most robust defense and includes other components like WiFi security, live 24/7 expert assistance for numerous computing needs. 

Key features:

  • Defends your PC from Internet attacks.
  • Control what files run on your PC.
  • Prevents malware from being installed.
  • Auto Sandbox Technology.
  • Cloud based Behaviour Analysis.
  • Cloud based Behaviour Whitelisting.
  • Award winning & highly rated Firewall.