Simplify Mesh Tool simplifies the mesh in the given .obj file. This tool is easy to use and the GUI is clean and easy to understand. The only parameter needed is either the target number of remaining triangles or percentage to retain. The user does not need to set any trade-off between texture and geometry fidelity. The simplified model is guaranteed to be seamless free automatically.
Cruncher only supports triangular mesh.

Note: This app uses a custom installer (and not the standard App Store installer).