Gmsh is described as '3D finite element grid generator with a build-in CAD engine and post-processor. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric input and advanced visualization capabilities' and is an app in the Photos & Graphics category. There are more than 25 alternatives to Gmsh for a variety of platforms, including Windows, Linux, Mac, Android and Windows Phone. The best alternative is Blender, which is both free and Open Source. Other great apps like Gmsh are Autodesk Maya (Paid), Wings 3D (Free, Open Source), Autodesk 3ds Max (Paid) and Rhinoceros (Paid).
HyperMesh is a market-leading, multi-disciplinary finite element pre-processor which manages the generation of the largest, most complex models, starting with the import of a CAD geometry to exporting ready-to-run solver file.
ANSA is an advanced multidisciplinary CAE pre-processing tool that provides all the necessary functionality for full-model build up, from CAD data to ready-to-run solver input file, in a single integrated environment.
VoidWorld is a 3D modeling and animation tool. It provides a wide range of tools. The down load includes a few sample models and an online book which combines the user reference and tutorial examples, that would get you started quickly.
TetGen is a program to generate tetrahedral meshes of any 3D polyhedral domains. TetGen generates exact constrained Delaunay tetrahedralizations, boundary conforming Delaunay meshes, and Voronoi partitions.
enGrid is an open-source mesh generation software with CFD applications in mind. enGrid uses an in-house development for surface meshing and prismatic boundary layers; a module for hex far-fields will be added in the next release.