Formerly called Select Check.  Provides an online service to check on a tax exempt organization's federal tax status and filings and whether the organization is eligible to receive tax-deductible charitable contributions. 

Search charities by name and location, provides IRS 990 financial form information. Additional information is available with free registration

Search for charities by keyword, with financial evaluations, rankings and ratings. 

Includes Registry of Charitable Trusts, giving guides, complaint forms, and regulations. 

Charity listings with effectiveness evaluations, financial information, and complaints.