echoserver is a TCP/IP echo server. It's just a developer tool, and is not meant to be used in production environments for a long time.
SockThread is an implementation of multi-threaded sockets. It is has a built-in echo server for telnet connections. It was written with standard native C/C++ libraries. C++ classes std::thread and C socket APIs <sys/socket.h> were used.
A virus checking module for Python that uses the clamd daemon from ClamAV.
Asteroids on steroids.