The repository contains reference implementations for Pleco and Plectron -- two provably secure password hashing algorithms
About the names
Pleco or Plecostomus is a kind of fishes that is very popular among aquarists, as Pleco fishes help keeping water clean. The word Plecostomus itself means folded mouth.
Plectron is a small piece of metal or plastic that is used to plunk musical instruments.
The source code is released under the MIT license, if not otherwise specified.