Available to Thrall cardholders. "Comprehensive source of detailed information concerning nonprofit U.S. membership organizations of national scope. Covers more than 23,000 organizations in categories such as trade, business, and commercial; legal, governmental, public administration, and military; cultural; educational; veterans, hereditary, and patriotic; athletic and sports; fan clubs, and many more."
"Charity Navigator, America's premier independent charity evaluator, works to advance a more efficient and responsive philanthropic marketplace by evaluating" over 5,000 of America's charities.
The "donor's guide to the charitable universe", is a project of Philantropic Research Inc. Contains some information on 620,000 nonprofits. GuideStar powers the popular Internet guides NetworkForGood and JustGive, "a nonprofit organization whose mission is to connect people with the charities and causes they care about and to increase overall giving."