XYplorer, formerly TrackerV3, has been one of the highlights in the alt.comp.freeware newsgroup for a long time, with even the author posting and taking feedback.

Donations welcome, of course - 10 $ or EU, if you don't want to pay 25/30 for a professional licence.

Or, cynically, if you suspect the change of name may be a prelude to going no longer free, make a donation, as in most cases where that happens, voluntary donators usually end up being given a licence. (eg. Trillian).

No idea if that is likely, but the change from the rather incongruous "TrackerV3 version 4.x" to the catchy "Xyplorer" makes you wonder....