GuideStar
www.guidestar.org
Features a searchable database of tax-related and back-ground information for more than 640,000 nonprofit organizations that receive grants from foundations.

GrantSmart
www.grantsmart.org
Features a searchable database of tax-related information for more than 60,000 private foundations.

The Foundation Center
www.fdncenter.org
Collects and analyzes information on foundations and corporate giving. An auhoritative source on grant-giving and a mecca for grant-seekers. Features guides to funding research and to workshops on writing and researching grant proposals.

The Independent Sector
www.independentsector.org
A coalition of nonprofits, foundations and corporations, features information about giving and trends in the nonprofit community.

The National Committee for Responsive Philanthropy
www.ncrp.org
Promotes giving that addresses the needs of low-income communities and groups facing discrimination. It conducts action research, provides technical assistance to nonprofits and engages in policy advocacy.

The New Tithing Group
www.newtithing.org
Analyzes current giving patterns. It has the first online philanthropic budgeting tool that calculates a financial comfort level for donors.

Volunteer Solutions
www.volunteersolutions.org
Helps volunteers find nonprofits that need their help.

The Council on Foundations
www.cof.org
Links to member foundations and corporate Websites, primarily as a resource for grant-making foundations.