Investing in a professionally managed portfolio of loans to more than 240 nonprofits and social enterprises working in over 100 countries to alleviate poverty, the Calvert Foundation provides a searchable database of these different organizations. These investments are clustered in four principle impact sectors: housing, microlending, small business, and community development. The site also provides a tool for individuals to calculate the impact their investment will have based on the amount, duration, and sector of the investment.