OFF 3D model
OFF lists a mesh as plain text: a header with the vertex and face counts, one line per vertex, then one line per polygon giving its corner count and vertex indices. Variants add vertex colours (COFF) or normals (NOFF). Its simplicity made it the format of shape benchmarks such as Princeton's and ModelNet.
Opens in MeshLab, Geomview, CGAL, trimesh and most geometry-processing tools
OFF converter