AnyEvent(3pm) on Linux
The text 611c2ac1f40d, as Debian 10 (Buster) shipped it.
the DBI of event loop programming EV, Event, Glib, Tk, UV, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt, FLTK and POE are various supported event loops/environments.