had no idea the 3d filesystem from jurassic park was actual existing software and now i'm questioning every over the top CG hacking scene i've seen
There are some open-source remakes and clones. Here's one:
https://fsv.sourceforge.net/screenshots/
This one uses the same concept and is slightly more modern:
https://github.com/3dfsb-dev/3dfsb
I'm not finding anything that's actually maintained.