bsdproxy is a generic, event-driven proxy designed specifically for the BSD platform. It uses the kqueue()/kevent() system calls to determine when to relay data from one side of the connection to the other. It also uses GLib (http://www.gtk.org) data structures and memory management functions to optimize steady-state performance (minimize unnecessary memory allocation/deallocation). bsdproxy has been used to proxy HTTP, HTTPS, telnet, and mysql without any problems. It should be able to serve as a transparent proxy for anything over a TCP/IP connection. WWW: http://daveb.net/bsdproxy/