I found this:
I know we’ve been looking to include a dispersion relation solver. Well, here’s one. It’s MIT licensed; we could take care of packaging it properly on the repo’s side (add setup.py, etc, via pull request), then wrap it in PlasmaPy; or we could do the borg thing and assimilate it (of course, with @liangwang0734’s approval).
I don’t really use dispersion solvers atm, so I don’t know how feature complete or helpful this would be.