Starfish is a set of tools used for spectroscopic inference. It robustly determines stellar parameters using high resolution spectral models and uses Markov Chain Monte Carlo (MCMC) to explore the full posterior probability distribution of the stellar parameters. Additional potential applications include other types of spectra, such as unresolved stellar clusters or supernovae spectra.
https://ui.adsabs.harvard.edu/abs/2015ApJ...812..128C and https://doi.org/10.5281/zenodo.2221006