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://adsabs.harvard.edu/cgi-bin/nph-abs_connect?library&libname=WHAMP&libid=47d8e59e80