``plc`` is the public Planck Likelihood Code. It provides C and Fortran libraries that allow users to compute the log likelihoods of the temperature, polarization, and lensing maps. Optionally, it also provides a python version of this library, as well as tools to modify the predetermined options for some likelihoods (e.g. changing the high-ell and low-ell lmin and lmax values of the temperature).
Why do you think that https://github.com/python-poetry/poetry is a good alternative to plc-2.0