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We present a package for Mathematica that facilitates the numericalcomputation of the quasinormal mode (QNM) spectrum of a black hole/black brane.Requiring as input only the QNM equation(s), the application of a singleMathematica function will compute the spectrum efficiently, by discretizing theequation(s) and solving the resulting generalized eigenvalue equation. It isapplicable to a large variety of black holes, independent of their asymptotics.The package comes fully documented and with several tutorials. Here we presenta self-contained review of the method and consider several applications. Weillustrate the method in the simplest case of scalar QNMs of a Schwarzschildblack brane in anti-de Sitter. Then we go on to look at the scalar QNMs of theSchwarzschild black hole in de Sitter, in anti-de Sitter and in asymptoticallyflat spacetimes, finding a novel infinite set of purely imaginary modes in thefirst case. We also derive the QNM equations for a genericEinstein-Maxwell-scalar background and use these to compute the QNMs of theasymptotically anti-de Sitter Reissner-Nordstr\"{o}m black brane, as a furtherillustration and check of the method.

Overdamped modes in Schwarzschild-de Sitter and a Mathematica package for the numerical computation of quasinormal modes