# Library to compute eigenvalues of the Laplace operator in a polyhedral domain

What library can one use to compute efficiently the lowest eigenvalues of the Laplace operator in a polyhedral domain in $R^3$? For the application I have in mind one has to consider very acute polyhedra (which moreover are non-convex) so it would probably be necessary to use a smart enough algorithm that can deal well with what happens near the vertices.﻿