Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Burp Suite - Burp Suite is an integrated platform for performing security testing of web applications.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
OpenVAS - The Open Vulnerability Assessment System (OpenVAS) is a framework of several services and tools...
Komodia Relay - Free open source tool to perform TCP based session relay