Evaluates "the financial health of over 5,400 of America's largest charities."

This site provides "Coloradans with an additional way to find information about nonprofit organizations when individuals and businesses want to make a donation."

This site from the Internal Revenue service helps to identify organizations with federal tax exempt status.

"Idealist is an interactive site where people and organizations can exchange resources and ideas," identify job and volunteer opportunies, etc.

This source from the Better Business Bureau allows you to find a charity. It then provides the programs that charity supports, its tax status, and a financial summary.

"Look up the 990s of private foundations, public charities, and other nonprofits."

This institute develops and shares leading-edge research and insight on the nonprofit sector. Checkout the Blackbaud Institute Index and the Resources tabs.

This organizations provides workplace solutions "to payroll deduction charitable giving campaigns."

This group "conducts and disseminates research on the role and impact of nonprofit organizations and philanthropy."

This association serves nonprofits in Colorado.

This is "a national nonprofit association of approximately 2,000 grantmaking foundations and corporations."

This is a 501(c)(3) nonprofit organization with members "throughout the world. Since 1983, the Society has been providing nonprofit staff members, volunteers, and board members with affordable resources and information to work more effectively and efficiently towards accomplishing their mission."

This foundation annually publishes "Giving USA: The Annual Report on Philanthropy," "the seminal publication reporting on the sources and uses of charitable giving in the United States."