pxys is an efficient open proxy scanner software suite for Undernet IRC(u). It scans the clients' IPs to check for misconfigured WinGate, Cisco, SOCKS 4, SOCKS 5, some IRC bouncers, and other vulnerable HTTP proxies. Using the peak library for socket and asynchronous events handling, it is dedicated to run on huge IRCU networks, and is currently running on Undernet to avoid the overwhelming abuse of these proxy servers being exploited daily.
The PEAK library tries to achieve high performance in combining multi-threading with an efficient I/O event model. You can write event-based applications that use massive sockets I/O, timers, and signals. Its underlying I/O multiplexing engine supports kqueue(2) (FreeBSD, NetBSD, and Mac OS X), epoll(2) (Linux 2.6), and /dev/poll (Solaris). It provides support for optimized memory allocations, basic database primitives, and synchronization.