For all of you perceiving the GLDT as too vast, there is a useful new feature in the just released version 0.2 of gnuclad: slicing subtrees out of the whole cladogram.
Here is a small demonstration on Debian, Slackware and Red Hat.

On a related note, the new release also offers to scan files and directories, as seen with the GLDT folder or, as a larger example, gnuclad’s own hierarchy.