- Snort
 - Download for Snort, an open source network intrusion prevention and detection system utilizing a rule-driven language, which combines the benefits of signature, protocol, and anomaly-based inspection methods. - SmoothWall
- Software designed to produce a hardened Internet firewall device by turning a server, workstation, or redundant PC into a replacement for a hardware firewall router.
- SOCKS Proxy Protocol
- SOCKSv5 adds authentication and authentication method negotiation, message integrity and privacy, and UDP proxy.
- Microsoft Internet Security and Acceleration (ISA)Server@
- Port Knocking
- A system for stealthy authentication across closed ports.
- LeakTest
- Firewall testing utility from Gibson Research.
- Network Utilities (Systems) Ltd
- Suppliers of network administration tools and security software. Products include steel belted radius, VPNs, firewalls, and remote control software.
- Mason
- An automated firewall builder tool for Linux.
- How To SOCKSify
- Converting an application to use the SOCKS protocol normally only requires adding an #include directive and linking with the socks5 library.
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