http://xyst.i2p/meshconv_main.html
It can be used to convert tetrahedron meshes from and to either of the following formats: Gmsh, http:/ / www.geuz.org/ gmsh Netgen, https:/ / sourceforge.net/ projects/ netgen-mesher ExodusII, https:/ / github.com/ sandialabs/ seacas ASC, used in Jacob Waltz 's Chicoma code UGRID, https:/ / www.simcenter.msstate.edu/ software/ documentation/ aflr3 RDGFLO, https:/ / www.mae.ncsu.edu/ people/ hluo2 Medit, https:/ /...