... is a '3D - Filesystem Browser' for GNU/Linux, it was once my post popular Open Source project for many years. Current version is still 0.0.10 (seems to be stable). This version should also runs on BeOS and FreeBSD! (old Homepage)
TDFSB is quite old, so better try the fork 3dfsb instead. However, this version here compiles and runs for instance on Ubuntu 18.04.2 LTS. But it is much easier to sudo apt-get install tdfsb
Click the image for an old demo video on Youtube.