Established in 1981, the Golden Gate National Parks Conservancy is the nonprofit partner that supports and assists the Golden Gate National Parks in research, interpretation, and conservation programs. The Conservancy's work is undertaken with generous contributions from individual, corporate, and foundation donors, as well as income earned from operating park bookstores and cafes, publishing educational materials, producing interpretive merchandise, and providing park tours. Since its inception in 1981, the Parks Conservancy has provided the Golden Gate National Parks with more than $100 million in support and is recognized as one of the largest and most effective park partners in the country.

The Conservancy is focused on aiding the parks, and so does not offer visitors much besides volunteer opportunities. The website offers detailed visitor and historical information about all parks supported by the Conservancy, and also offers access to park stores and events calendars for each park.

The conservancy is a support organization. It does not offer a physical site for visitation.

"Founded in 1983, the Pennsylvania Heritage Society is the co-publisher of the award-winning quarterly magazine, Pennsylvania Heritage®, and serves a critical role as the non-profit organization supporting the Pennsylvania Historical and Museum Commission (PHMC), the state's official history agency. With the support of over 4,000 members from every corner of the state and beyond, the Heritage Society works with the PHMC on a variety of projects to preserve and interpret Pennsylvania's history, art, and culture."

The site offers an events calendar, information regarding upcoming events, an extensive online bookstore, and visitor information about a the Pennsylvania Trails of History, a statewide trail system.

Umbrella organization; does not appear to be affiliated with a specific historic site.

"Since 1994, the Nebraska Main Street program has made a difference in the lives of countless Nebraska residents by providing communities the opportunity to revitalize their traditional downtown commercial business districts through economic development and historic preservation." The main street program helps to revitalize downtown's across Nebraska by encouraging building restoration, raising community awareness, and providing resources and support to aid in the revitalization of downtown districts.

The site offers resources for preservationists, information regarding the organization, design services, and an events calendar.

This is a neighborhood revitalization organization.

The Connecticut Trust for Historic Preservation is a state-wide organization dedicated to helping individuals, local historical societies, and organizations with historic preservation. The trust offers a wide variety of resources ranging from documents to traveling lectures on preservation. The trust also can aid individuals and organizations with the restoration of historic properties.

The site offers extensive information on preservation and restoration, including self-help articles, information on educational programs, and links to other resources. Other online resources include a preservation white pages with contact information for all preservation organizations within the state of Connecticut, a preservation glossary, and information on historic properties in Connecticut.

Programming is primarily intended for property owners and preservation professionals.

Historic Waxahachie was organized in 1977 with the intention to "educate the public to the cultural, historic, and economic benefits of Waxahachie's unique social and architectural history." Waxahachie is notable for containing an impressive concentration of turn of the century commercial and residential architecture. Current projects of the organization include the Wyatt Building restoration, Calaboose restoration, and the upcoming railroad depot project.

The site offers basic information about the organization, information for prospective members, and information regarding the educational programs, open to the public, put on by the organization throughout the year.

This organization does not operate physical sites for visitation. Brochures are offered for self-guided area tours.

AMIA is a nonprofit professional association established to advance the field of moving image archiving by fostering cooperation among individuals and organizations concerned with the acquisition, description, preservation, exhibition, and use of moving image materials.

More a professional organization than an organization providing resources for the general public, it appears.

Does not appear to be affiliated with a specific historical site.

The Agency operates over 60 historic sites and memorials. The Agency also administers the Abraham Lincoln Presidential Library and Museum.

The agency offers conferences and educational programs.

Umbrella organization, operating 60+ historical sites.

America the Beautiful Fund is a national nonprofit organization started in 1965 to encourage volunteer citizen efforts and to protect the natural and historic beauty of America.

More a conservation organization than individual historic sites.

The National Association for Olmsted Parks (NAOP), established in 1980, is a coalition of design and preservation professionals, historic property and park managers, scholars, municipal officials, citizen activists, and representatives of numerous Olmsted organizations around the United States. Its concern is the legacy of landscape work left by Frederick Law Olmsted Sr. and the firm founded by his sons, Olmsted Brothers Landscape Architects (OBLA).

Appears to be an umbrella organization, not affiliated with a specific historic site.