(Since someone already mentioned bedrocklinux, I’ll try harder)

… Try putting the Ironclad kernel in Exherbo. ;D

I see no one has mentioned Bedrock Linux yet. Not sure though how others would rate its ‘obscurity’ though. It’s definitely a standout among distros.

No one mentioned Bunsenlabs or Crunchbang Linux here, but they aren’t really that obscure.

Linux STD! Waaaay before skiddos had backtrack or kali

There was this distro that stuffs everything of a package in one folder, instead of /usr/lib & co. What was it called again?