PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Next-Generation Intrusion Prevention System (NGIPS) - Cisco Firepower NGIPS (Next-Generation IPS) provides contextual awareness, security intelligence, and advanced threat protection against attacks and malware.
Komodia Relay - Free open source tool to perform TCP based session relay
snort - Snort is a free and open source network intrusion prevention system.
Portfwd - Portfwd, Port Forwarding Daemon, stands for port forwarding daemon.
Suricata - Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine.