The following links and resources may be helpful to you:

General Resources
Issue-Specific Resources

General Resources

Council on Foundations
Foundation Center
Guidestar
BoardSource
Maryland Association of Non-Profit Organizations
Association of Baltimore Area Grantmakers

Issue-Specific Resources

International Human Rights Funders Group
Jewish Funders Network
Grantmakers for Education
Grantmakers without Borders
National Network of Grantmakers