POE is a framework for cooperative, event driven multitasking in Perl.

POE originally was developed as the core of a persistent object server and
runtime environment. It has evolved into a general purpose multitasking and
networking framework, encompassing and providing a consistent interface to
other event loops such as Event and the Tk and Gtk toolkits.

POE is a mature framework for creating multitasking programs in Perl. It has
been in active development since 1998. It has been used in mission-critical
systems such as internetworked financial markets, file systems, commerce and
application servers.