Lightweight graphical Java based file watcher similar in functionality to tail. Includes additional per-file features like pausing, setting polling frequency, font size, and buffer size, refresh, in-pause tail, and clear.
X Message Daemon is a background program which displays simple text-based messages on your X display. You can choose parameters such as color, font, icon, duration, ... It also has a frontend Perl daemon and a client to, for example, tail your log files