Alternatives to Marriage Project (ATMP)
Provides resources, advocacy, and support for people who are unmarried, cohabit, are domestic partners, are living together, or are thinking about whether to marry.
Alliance for Marriage
Non-partisan research and education organization dedicated to promoting marriage and addressing the epidemic of fatherless families in the United States.
Straight Spouse Support Network
Provides support and information to straight spouses and former spouses of gay, lesbian, and bisexual mates.