MiMC

• Sage reference implementations are available here for GF(2^129) and here for GF(2^7). A C++ implementation for GF(2^7) can be found here. Round constants can be generated using this script.

GMiMC

• A script to calculate round numbers and reference code will appear here shortly!

Starkad and Poseidon

• Reference implementations and scripts to calculate round numbers, round constants, and MDS matrices can be found here.