For individuals:

www.volunteermatch.org - brings people together to strengthen communities by making it easier for good people and good causes to connect. The organization offers a variety of online services to support a community of nonprofit, volunteer, and business leaders committed to civic engagement.

www.care2.com - provides all you need in one place to make a difference. With a trusted network of over 10 million individuals making a difference through 3,000 interest groups, it's the largest online community of people making a difference in healthy, green living, human rights, and animal welfare.

www.globalgiving.com - connects you to the causes and countries you care about. You select the projects you want to support and you get regular progress updates to see your impact.

www.kiva.org - lets you lend to a specific entrepreneur in the developing world – empowering them to lift themselves out of poverty.

For corporations:

www.charitynavigator.org - works to advance a more efficient and responsive philanthropic marketplace by evaluating the financial health of America's largest charities.

www.guidestar.org – connects people with nonprofits through offering a comprehensive array of search and research tools as well as customized solutions.

www.charityguide.com - promotes flexible volunteerism, by inspiring and facilitating acts of kindness, their Charity Guide volunteer directory makes it possible for everyone even busy people to make a difference at anytime, from anywhere.