The Philanthropic Initiative
Non-profit organization promotes growth of strategic philanthropy through research, educational programming, and consulting services. Provides profile of services, philanthropy articles, forum, email list, and events calendar.
http://www.tpi.org/

National Charitable Gift Fund
A tax-exempt publicly supported community trust.
http://www.managed-giving.org/

The Jewish Communal Fund
Provides donors the opportunity to simplify their charitable giving and maximize tax savings through the use of donor-advised funds.
http://www.jewishcommunalfund.org/

JustGive.org
Connects people with charities and causes. Provides a searchable nonprofit database, ways to give, donor info, inspiring stories and quotes, newsletter, and nonprofit resources.
http://www.justgive.org/

Institute for Philanthropy
Aims to promote philanthropy via research, debate, publications and by encouraging the philanthropic sector in Britain. Includes research and study opportunities, areas of activity, newsletter, and contact information.
http://www.instituteforphilanthropy.org.uk/

National Committee for Responsive Philanthropy
Committed to making organized philanthropy more responsive to socially, economically and politically disenfranchised people. Features publications, current projects, and membership information.
http://www.ncrp.org/

National Center for Family Philanthropy
Encourages families and individuals to create and sustain philanthropic family foundations. Offers programs, publications, articles, resource links, a newsletter, calendar of events, and a FAQ.
http://www.ncfp.org/

More Than Money
An organization that helps wealthy people learn to use their resources to create a better world. Features a quarterly journal, membership information, events, discussions, coaching groups, and an online store.
http://www.morethanmoney.org/

International Society for Third-Sector Research (ISTR)
Promotes research and education in the philanthropy, civil society and nonprofit sectors. Includes membership information, affinity groups, conferences, and publications.
http://www.istr.org/

Philanthropy Roundtable
Association of nonprofit professionals and private donors. Features organization profile, history, email newsletter, the magazine "Philanthropy", online store, and meetings information.
http://www.philanthropyroundtable.org/