Charity Choice
Encyclopedia of British charitable organizations in 27 categories in a fully searchable database.

Charity Guide
Searchable database of United States nonprofits. Website also features donation guide, procedures by which organizations can be listed.

Charity Portal UK
Searchable directory of UK charities. Charities listed by type, discussion forum and donation by click.

CharityAmerica.com
An online "village" that unites donors, volunteers, businesses, and qualified charities from across the nation.

CharityEzone
Portal for researching non-profit groups in the US; includes links to news and ratings sites, venture philanthropy information, and gateway to search the IRS database.

CharityGuide.org
A directory site for people who want to contribute to society but need ideas or motivation.

International Volunteer Programs Association
A comprehensive search and information site for international volunteer opportunities.

Volunteer Solutions
Find the perfect volunteer opportunity online. Has opportunities for a few major American cities.

VolunteerMatch
Thousands of volunteer opportunities online, sorted by category - including virtual volunteering where you can work from home. Free to both organizations and volunteers.