Foundation Directory Online: includes information on U.S.-based private and corporate foundations that fund national and international projects. The database includes information on each foundation’s application process, the number and amounts of grants given each year, recently awarded grants and their recipients, geographic focus, and more.
National Center for Charitable Statistics: a broad array of data on the nonprofit sector including IRS 990 tax data, survey panels, and political action committees.
Business Source Complete:to find articles, search for corporations charitable giving. You can also combine it with a company name.