A voluntary carbon market project is similar to a CDM project but it is not regulated by the UNFCCC. There are a variety of different standards that can be applied, dependent on the project type and size. The project developer can select the most relevant standard. Some standards are:
 

Carbon Fix - www.carbonfix.info

Gold Standard -  www.cdmgoldstandard.org

Plan Vivo -  www.planvivo.org

Voluntary Carbon Standard -  http://www.v-c-s.org

Voluntary carbon market projects generate Voluntary Emissions Reductions (VERs).