What was the 3D file browser used in Jurassic Park?
Solution 1:
3D file browser was FSN on IRIX, there are similar opensource browser http://fsv.sourceforge.net/ .
It's really just for looking cool, not very useful.
Solution 2:
I believe it was the File System Navigator in IRIX.
Solution 3:
To answer your second question - it's no longer relevant.
3D file systems are really just a gimmick. They don't add anything to the user experience & usually get in the way.