Enzymind Labs

Once a polygonal mesh is extracted from volumetric data, any imperfections need to be resolved and validated. These imperfections might includes holes (each surface needs to be topologically closed), intersecting polygons and singularities. I won't know how much editing will be needed before I try the surface extraction with a few sets of parameters.

It looks like MeshLab might be a good surface editing tool:

"MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes.

The system is aimed to help the processing of the typical not-so-small unstructured models arising in 3D scanning, providing a set of tools for editing, cleaning, healing, inspecting, rendering and converting this kind of meshes.

Aim@Shape repository has a fantastic library of mostly single surface models:

"The AIM@SHAPE Shape Repository is a shared repository populated with a collection of digital shapes. It is an integral part of the e-Science framework of tools and services for modeling, processing and interpreting digital shapes, developed within the AIM@SHAPE project.

Our goal is to include a variety of standard test cases and benchmarks, so as to enable efficient prototyping as well as practical evaluation on real-world and large-scale shape models. The emphasis is on `certified shapes' whose properties are additionally reflected in accompanying metadata specifed by shape ontologies developed by the AIM@SHAPE consortium."

Nasa/Stanford biocomputation surface reconstruction