AnyEvent(3pm) on Linux
The text 29e4fe70e87d, as Debian 12 (Bookworm) 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.