LISTEN (7)           - listen for a notification
acpi_listen (8)      - ACPI event listener
corosync-notifyd (8) - Listen for important corosync events and send dbus and...
listen (2)           - listen for connections on a socket
Log::Any (3pm)       - - Bringing loggers and listeners together
nc (1)               - arbitrary TCP and UDP connections and listens
nc.openbsd (1)       - arbitrary TCP and UDP connections and listens
nc_openbsd (1)       - arbitrary TCP and UDP connections and listens
Net::SSH2::Listener (3pm) - SSH 2 listener object
netcat (1)           - arbitrary TCP and UDP connections and listens
rtmon (8)            - listens to and monitors RTnetlink
UNLISTEN (7)         - stop listening for a notification