WHAMP - Waves in Homogeneous Anisotropic Magnetized Plasma. Fortran code, originally written by Kjell Rönnmark, that calculates general wave dispersion relation in plasmas.
Package includes also a matlab code to run WHAMP from inside MATLAB and to visualize distribution functions.
Some articles that use WHAMP: https://ui.adsabs.harvard.edu/publ 60E5 ic-libraries/Iw3OYJ1iQa2WSeG8SfHxyg