Charity Choice
   Encyclopedia of British charitable organizations in 27 categories in a fully searchable database.
   http://www.charitychoice.co.uk/

Charity Guide
   Searchable database of United States nonprofits. Website also features donation guide, procedures by which organizations can be listed.
   http://www.charity-charities.org/

Charity Portal UK
   Searchable directory of UK charities. Charities listed by type, discussion forum and donation by click.
   http://www.charityportal.org.uk/

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.
   http://www.charityezone.com/

CharityGuide.org
   Directory of editorially-reviewed volunteer opportunities, which are entirely flexible and immediately actionable. Also includes volunteer vacations.
   http://charityguide.org/

Hands On Twin Cities
   Lists volunteer opportunities in the Minneapolis/St. Paul area. Also provides volunteer educational resources and training services.
   http://www.handsontwincities.org

International Volunteer Programs Association
   A comprehensive search and information site for international volunteer opportunities.
   http://www.volunteerinternational.org

TechMission: ChristianVolunteering.org
   Matches volunteers with Christian social service organizations, nonprofits and churches to provide opportunities in urban ministry, youth programs, short-term missions, and virtual volunteering.
   http://www.christianvolunteering.org

Volunteer Abroad
   Directory for international volunteer programs. Search by region, country, type of work or project duration.
   http://www.volunteerabroad.com/

Volunteer Solutions
   Find the perfect volunteer opportunity online. Has opportunities for a few major American cities.
   http://volunteersolutions.org/