Wonderland Hill Development Co. in Boulder, Colo., has developed 20 communities and is working on several more. The core values of the organization are based on “personal values, community, organic design, and sustainable building practices and principles.” James W. Leach is president; Terri Furman is director of sales and marketing.

Silver Sage Village in Boulder, Colo., broke ground in August 2006 and is Colorado’s first cohousing development for seniors. With a spiritual core, the ecofriendly community has a common meditation room.

Sand River Cohousing is a 26-family community of elders developed in Santa Fe, N.M., based on shared values, including spiritual growth. Contact Coreen Plewa.

The United Coalition of Reason organizes local nontheistic groups into coalitions and then conducts campaigns aimed at raising their visibility. Jason Heap is national director.

The Oakcreek Cohousing Community was completed in 2012 and is run and staffed by the community members themselves. It houses seniors in its 24 units and works to create an interdependent, supportive community. It is located in Stillwater, Oklahoma.

The Stiefel Freethought Foundation provides strategic and financial assistance to the freethought movement. The foundation strives to gain respect for freethinkers and ensure total separation of church and state. Todd Stiefel of Raleigh, N.C., is founder and president.

The Skeptics Society is a scientific and educational organization that investigates fringe science and paranormal claims and strives to promote critical thinking. Michael Shermer is executive director, and he also serves as publisher of the group’s magazine, Skeptic.

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.”

Arboretum Cohousing is a 40-unit development in Madison, Wis. It includes affordable housing through Habitat for Humanity of Dane County.