GreenFaith is an interfaith coalition that works with houses of worship, religious schools and people of all faiths to help them become better environmental stewards. The Rev. Fletcher Harper is executive director.

The New York State Community Justice Forum in Rensselaer, N.Y., provides training and assistance in community and restorative justice. The difference: Community justice works to prevent crime and promote community, while restorative justice works for reparation after a crime has been committed.

The Center for the Study of Ethnicity and Race at Columbia University in New York is dedicated to promoting innovative thinking about race, ethnicity and other categories of difference to better understand their roles and impacts on society.

Race, Ethnicity & Religion Project at Cornell University in Ithaca, N.Y. is dedicated to the research and study of the relationship between race, ethnicity and religion in the U.S. Contact project coordinator Kornelia Tancheva.

The American Museum of Natural History maintains a Darwin section on its website based on a popular exhibit that appeared at the New York City museum from 2005 to 2006. The exhibition has traveled to Boston, Toronto and Chicago before going to the Natural History Museum in London for the 200th anniversary of Darwin’s birth.

Unmarried Equality (originally the Alternatives to Marriage Project) is a nonprofit organization that advocates for equality and fairness for unmarried people. The organization, which is based in Brooklyn, N.Y., says it does not oppose marriage but wants validation and support, including nondiscriminatory public policies, for those who are single or in nonmarital relationships.

Faith in New York, which is affiliated with PICO, is involved in affordable housing.

The Robert Green Ingersoll Birthplace Museum in Dresden, N.Y., is described as America’s only freethought museum. It tells the story of the noted 19th-century agnostic orator, including his most famous speech, “Ghosts.”

The Humanist Institute explores humanist values and trains future leaders. Its seminars are held primarily in New York City and Washington, D.C. Kendyl R. Gibbons and Carol Wintermute are co-deans of the institute. Contact through the website.