BostonResourceNet.org — A collaboration between Action for Boston Community Development and the Boston Public Health Commission, providing information on 2,000 organizations and agencies.

GuideStar — A premier, fee-based database service that provides information on nonprofits that looks to connect nonprofits with grantmakers and donors.

Human Service Forum — Association of 170 nonprofit, public agencies, and individuals providing human services in the Pioneer Valley.

idealist.org — A searchable listing of more than 50,000 nonprofit and community organizations in 165 countries.

Independent Sector — National organization of leading nonprofits, foundations, and corporations focused on strengthening not-for-profit initiative, philanthropy, and citizen action.

Mass. Council of Human Service Providers — Statewide association of private, community-based care giving organizations which provide educational, health, and social services.

MassINC — Independent, nonpartisan research and educational institute that develops and publishes research on public policy issues in Massachusetts, and hosts related events.

Massachusetts Nonprofit Network — Statewide association, launched in 2007, that brings together nonprofits of all sizes, operating in every area of Massachusetts and in every subsector.

Massachusetts Service Alliance —Nonprofit organization that serves as the state commission on community service to support high quality service and volunteer opportunities for stronger communities and more active citizens.

National Council of Nonprofit Associations is the network of state and regional nonprofit associations serving over 22,000 members in 45 states and the District of Columbia.

New England Women Business Owners — The premier organization for women business owners in New England, which growth through networking, education, and peer support.

Third Sector New England — Provides support, training and management resources to strengthen individual nonprofit organizations and build the capacity of the progressive nonprofit community.