freeFEM3D

freeFEM3D is a 3D version of freeFEM. It is a 3D finite element PDE solver. It does not use standard FEM approximation but is based on fictitious domain method. The main reason for this is the absence of free 3D mesh generators. freeFEM3D, as well as its cousins (FreeFEM, FreeFEM+ and FreeFEM++), is a PDE solver driven by a user friendly language.
Find freeFEM3D at: http://www.freefem.org