The Philanthropy Roundtable -- The Roundtable is an association of donors who understand that voluntary private action offers the best means of addressing society's needs. In addition to offering expert advice and counsel, the Roundtable puts donors in touch with peers who share similar concerns and interests.

Atlas Economic Research Foundation -- The Atlas Foundation, created to help develop and strengthen global market-oriented think tanks, maintains a Free Market Directory providing contact and program information about non-profits that have shared in Atlas's work or that pursue a similar vision.

GuideStar -- GuideStar provides detailed operational and financial information for more than 850,000 IRS recognized nonprofit organizations allowing donors to be more discriminating in their support.

Capital Research Center -- CRC was established in 1984 to study non-profit organizations, with a special focus on reviving the American traditions of charity, philanthropy, and voluntarism.

Acton Institute -- Acton maintains an online database called The Guide to Effective Compassion. Its listings include over 150 private social service organizations selected by Acton for excellence in mission, execution, and independence.

Charity Navigator -- Charity Navigator works to advance a more efficient and responsive philanthropic marketplace by evaluating the financial health of America's largest charities.