xtail - 2.1-6 main

xtail watches the growth of files. It's like running a "tail -f" on
a bunch of files at once. It notices if a file is truncated and starts
from the beginning. You can specify both filenames and directories on
the command line. If you specify a directory, it watches all the files
in that directory. It will notice when new files are created (and
start watching them) or when old files are deleted (and stop watching
them).
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Note that xtail isn't a graphical (X11) program, it runs on a plain tty.
The name likely comes from "eXtended tail" or such.