Chilkat SSL COM Component 

Chilkat SSL is a free COM component that makes it extremely easy to communicate securely over a TCP socket using either the SSLv3 or TLSv1 protocols.
ssl sslv3 tls tlsv1 tcp tcp/ip socket c++ com component message xml client server

Proxy Workbench 

Proxy Workbench is a unique proxy server ideal for developers, trainers and security experts that displays its data in real-time.
proxy workbench proxy server socket tcp udp sockets tcp sockets packet sniffing socket protocols packet sniffer protocol analyzer protocol analyser tcp/ip winsock

Socket Workbench 

Socket Workbench is the definitive tool for analysing socket communications that underlie the Internet and several types of inter-process communication.
socket workbench udp socket tcp udp sockets tcp sockets packet sniffing socket protocols packet sniffer protocol analyzer protocol analyser tcp/ip networking sockets