hsclock is an accurate, multi-zone GTK clock that can also run in a tty. Currently configuration is solely by commandline options. hsclock uses GTK timeouts to synchronize with the system clock, making display updates accurate to within milliseconds. The time output format can be set with a date-like format option.
linkchk is a network link ping monitor. It supports both IPv4 and IPv6. It works by repeatedly pinging a named host or the default gateway of a given interface. When the link is working the ping time is shown in a small GTK window or tty, otherwise the link status is shown. It is particularly useful for monitoring IP tunnels or dialup links.